A simple random sample of size n = 49 is obtained from a population with u = 89 and o = 21.
(a) Describe the sampling distribution of x.
(b) What is P (x > 94.55) ?
(c) What is P (XS 82.85) ?
(d) What is P (86.3 (a) Choose the correct description of the shape of the sampling distribution of x.
O A. The distribution is skewed right.
B. The distribution is approximately normal.
O C. The distribution is uniform.
D. The distribution is skewed left.
E. The shape of the distribution is unknown.

Answers

Answer 1

Answer:

a) B. The distribution is approximately normal.

b) 0.0322 = 3.22%

c) 0.0202 = 2.02%

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean  and standard deviation , the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean and standard deviation:

[tex]\mu = 89, \sigma = 21[/tex]

Sample of 49:

This means that [tex]n = 49, s = \frac{21}{\sqrt{49}} = 3[/tex]

(a) Describe the sampling distribution of x.

By the Central Limit Theorem, approximately normal, and the correct answer is given by option B.

(b) What is P (x > 94.55) ?

This is 1 subtracted by the p-value of Z when X = 94.55, so:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

By the Central Limit Theorem

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{94.55 - 89}{3}[/tex]

[tex]Z = 1.85[/tex]

[tex]Z = 1.85[/tex] has a p-value of 0.9678.

1 - 0.9678 = 0.0322

So 0.0322 = 3.22%

Question c:

This is the p-value of Z when X = 82.85. So

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{82.85 - 89}{3}[/tex]

[tex]Z = -2.05[/tex]

[tex]Z = -2.05[/tex] has a p-value of 0.0202.

So

0.0202 = 2.02%


Related Questions

The ratio of the side lengths of Rectangle A to Rectangle B is 3 to 7. What is the
ratio of their areas?

Answers

9514 1404 393

Answer:

  9 : 49

Step-by-step explanation:

Assuming the rectangles are similar, the ratio of their areas is the square of the ratio of their side lengths.

  sides ratio = 3 : 7

  areas ratio = 3² : 7² = 9 : 49

1/x-2/3=3/2x find x

Answers

Answer:

1/x-2/3=3/2x

-2/3=3/2x-1/x

-2/3=(3-2)/2x

-2/3=1/2x

by cross multiplication

-2(2x)=1(3)

-4x=3

x= -3/4

Step-by-step explanation:

I hope this will help

plz mark as brainliest

My class consists of 8 men and 7 women. I want to pick a group of 6 people for research.
Write each answer using fraction as needed.
a. In how many different ways can I pick this group?
b. What is the probability of having exactly 3 men in the group?
c. What is the probability of all the selected people in group are women?
d. What is the probability of having at least one man in the group?

Answers

Answer:

a.5005

b.[tex]\frac{1960}{5005}[/tex]

c.1/715

d.714/715

Step-by-step explanation:

We are given that

Total men=8

Total women=7

Total people, n=8+7=15

r=6

a.

Combination formula:

Selection of r out of n people by total number of ways

[tex]nC_r[/tex]

Using the formula

We have n=15

r=6

Total number of ways=[tex]15C_6[/tex]

Total number of ways=[tex]\frac{15!}{6!9!}[/tex]

Using the formula

[tex]nC_r=\frac{n!}{r!(n-r)!}[/tex]

Total number of ways=[tex]\frac{15\times 14\times 13\times 12\times 11\times 10\times 9!}{6\times 5\times 4\times 3\times 2\times 1\times 9!}[/tex]

Total number of ways=5005

b. The probability of having exactly 3 men in the group

=[tex]\frac{8C_3\times 7C_3}{15C_6}[/tex]

Using the formula

Probability,[tex]P(E)=\frac{favorable\;cases}{Total\;number\;of\;cases}[/tex]

The probability of having exactly 3 men in the group=[tex]\frac{\frac{8!}{3!5!}\times \frac{7!}{3!4!}}{5005}[/tex]

=[tex]\frac{\frac{8\times 7\times 6\times 5!}{3\times 2\times 1\times 5!}\times \frac{ 7\times 6\times 5\times 4!}{3\times 2\times 1\times 4!}}{5005}[/tex]

=[tex]\frac{56\times 35}{5005}[/tex]

The probability of having exactly 3 men in the group

=[tex]\frac{1960}{5005}[/tex]

c. The probability of all the selected people in the group are women

=[tex]\frac{8C_0\times 7C_6}{5005}[/tex]

The probability of all the selected people in the group are women

[tex]=\frac{\frac{8!}{0!8!}\times \frac{7\times 6!}{6!1!}}{5005}[/tex]

The probability of all the selected people in the group are women

[tex]=\frac{7}{5005}=\frac{1}{715}[/tex]

d. The probability of having at least one man in the group

=1- probability of all the selected people in group are women

The probability of having at least one man in the group

[tex]=1-\frac{1}{715}[/tex]

[tex]=\frac{715-1}{715}[/tex]

[tex]=\frac{714}{715}[/tex]

The probability of having at least one man in the group [tex]=\frac{714}{715}[/tex]

Answer by any chance?❤️

Answers

Step-by-step explanation:

Question 2.

[tex] \frac{ \frac{6}{7} }{ \frac{9}{14} } [/tex]

[tex] = \frac{6}{7} \times \frac{14}{9} [/tex]

[tex] = \frac{2}{1} \times \frac{2}{3} [/tex]

[tex] = \frac{4}{3} = 1 \frac{1}{3} (Ans) [/tex]

Question 3.

[tex] \frac{18}{x} = \frac{6}{10} [/tex]

[By cross multiplication]

=> 18 × 10 = 6 × x

[tex] = > \frac{18 \times 10}{6} = x[/tex]

=> 3 × 10 = x

=> x = 30 (Ans)

The x - intercept of the function f(x) = x2 + 4x - 12 is:

A) (-4,0)(3,0)

B) (-2,0)(6,0)

C) (-6,0)(2,0)

D)(4,0)(-3,0)

PLEAEE HELP ITS REALLY URGENT AND WILL MARK AS BRAINLIEST!!!

Answers

Answer:

C) (-6,0)(2,0)

For x-intercept, f(x) = 0:

[tex]{ \tt{ {x}^{2} + 4x - 12 = 0 }} \\ { \tt{(x - 2)(x + 6) = 0}} [/tex]

Answer:

C) (-6,0)(2,0)

Step-by-step explanation:

f(x)= x²+4x-12

(x-2)(x+6)=0

x=2

x=-6

Question 4 of 10
What else would need to be congruent to show that ABC= AXYZ by SAS?

Answers

Answer:

D

Step-by-step explanation:

The correct answer is D. Answered by Gauthmath

the sum of five consecutive number is 45​

Answers

Answer:

7, 8, 9, 10, 11

Step-by-step explanation:

7+8+9+10+11

7 + 8 = 15

15 + 9 = 24

24 + 10 = 34

34 + 11 = 45

to solve algebraically, you can represent this as x + (x+1) + (x+2) + (x+3) + (x+4) = 45
after we combine like terms we get
5x + 10 = 45
- 10 - 10
———————
5x = 35
x = 7
which means, the answer is 7,8,9,10,11. you get this by substituting the x value into the equation

Which of the following phrases should not be expressed using a negative number?

Answers

Answer:

its 1900 Bc. Because BC stand for before chirst

Step-by-step explanation:

Use a linear approximation (or differentials) to estimate the given number. (Round your answer to five decimal places.)
[tex] \sqrt[3 ]{28} [/tex]

Answers

Answer:

Mix fraction: 3 1/27

Improper fraction: 82/27

Decimal approximation: 3.037

Step-by-step explanation:

What value is close to 28 that is a perfect cube...27 which equals 3^3.

So let's find the tangent line to the curve y=cubert(x) at x=27.

We will use this equation to approximate what happens at x=28.

First let's rewrite the radical in our equation;

y=x^(1/3)

Now differentiate

y'=(1/3) x^(1/3-1) by power rule

Simplify

y'=(1/3) x^(-2/3) or (1)/(3x^[2/3])

So the slope of our tangent line at x=27 is (1)/(3(27)^[2/3])=1/(3(3)^2)=1/(3×9)=1/27.

We will also need a point on this tangent line....We know we have the point at x=27 because that is what our tangent line to curve is being found at.

So at x=27, we have y=cubert(27)=3. We used our equation y=cubert(x) here.

So we want to find the equation of the line that contains point (27,3) and has slope 1/27.

Point-slope form is

y-y1=m(x-x1)

Plug in our values

y-3=(1/27)(x-27)

Add 3 on both sides

y=3+(1/27)(x-27)

We will use this linear equation to approximate cubert(28) by replacing x with 28.

y=3+(1/27)(28-27)

y=3+(1/27)(1)

y=3+1/27

You can write that as a mix fraction if you want.

This value is than 3 but super close to 3 since 1/27 is close to 0.

Mix fraction: 3 1/27

Improper fraction: 82/27

Decimal approximation: 3.037

Cubert of 28 when smashed into calculator as is gives approximately 3.0366 which is pretty close to our approximation.

Using a linear approximation method  f'(29)   3.1465.

What is linear approximation method?

A linear approximation is an approximation of a general function using a linear function (specifically, an affine function). They are widely used in the finite difference method to establish first-order methods to solve or approximate the solutions of  equations.

Linear approximation, or linearization, is a method by which we can  approximate the value of a function at a certain point. The reason linear approximation is useful is that finding the value of a function at a particular point can be difficult. Square roots are a good example of this.

Linear approximated as:

f(x+Δx)≈f (x)+Δx x[tex]f^{'}[/tex](x)

Take x = 28 and Δx = 1

f(x) = [tex]\sqrt[3]{x}[/tex]

Substitute 28for x

f(x) = [tex]\sqrt[3]{28}[/tex]

f(x) = 3.0365

So, we have

f(x+Δx)≈f (x)+Δx x[tex]f^{'}[/tex](x)

f(28+1)3.0365+1.[tex]f^{'}[/tex](x)

f(29)3.0365+1.[tex]f^{'}[/tex](x)

To calculate f'(x)

We have

f(x)=[tex]\sqrt[3]{x}[/tex]

Rewrite as

f(x)= [tex]x^{\frac{1}{3} }[/tex]

Differentiate

[tex]f^{'}[/tex]= [tex]\frac{1}{3}[/tex][tex]X^{\frac{1}{3}-1 }[/tex]

f' = [tex]\frac{1}{3}[/tex] . [tex]\frac{x^{\frac{1}{3} } }{3x}[/tex]

f'(29) = [tex]\frac{29^{\frac{1}{3} } }{3\times29}[/tex]

f'(29) =9.66/87

f'(29)  = 3.22/29

f'(29)   3.0365+1x 3.22/29

f'(29)  3.0365+ 0.1110

f'(29)   3.1465

To learn more about differential  equation, refer;

https://brainly.com/question/14620493

#SPJ2

Can someone help me on 6?

Answers

Answer:

66600 ft

Step-by-step explanation:

First draw a rectangle and draw a diagonal line in the middle. The line makes two triangles, and the line itself is the hypotenuse. So, to find hypotenuse, the formula is:

a^2 + b^2 = c^2

The variable c defines the hypotenuse. Therefore:

a = 150

b = 210

Let's solve:

150^2 + 210^2 = c^2

22500 + 44100 = c^2

66600 = c^2

Therefore, in conclusion, the result we are getting is 66600 ft.

Hope This Helps!

Answer:

30√74 ft or 258.070 ft rounded to three decimal places.

Step-by-step explanation:

To find the length of a diagonal, add the square of the width and the square of the length together and find the square root of the sum.

d = √210² + 150²

d = √44100 + 22500

d = √66600

d = 258.069758 ft (This is the answer I got in six decimal places. Rounding it to three, as it says in the question, would be 258.07 ft, as 7 is greater than 5 (the third digit was 9 by the way).)

An exact answer to that, in radical form, is 30√74 ft.

Please help , write your answer I will be giving 10 points

Answers

Answer:

yes it represents the graph accurately

Plz I need help on this question

Answers

Answer:

11.33

Step-by-step explanation:

First find the markup

8.80 * 25%

8.8 *.25 = 2.20

The new price is 8.80+2.20 = 11

Now find the tax

11*.03

.33

Add the tax to the new price

11+.33

11.33

Answer:

$11.33

Step-by-step explanation:

First divide 25% by 100, 0.25.

Then multiply 8.80 x 0.25 = 11.

Again, divide 3% by 100, 0.03

Then finally take 11.00 and multiply it with 0.03.

11.00 x 0.03=

$11.33

How many millitiers are in 4.55 liters?

Answers

Answer:

v nnv vb n

Step-by-step explanation:

b ng chfxhc.jx.gc,fhxfgfdkhgvn gghcjfuoctykfd mmyegfiuegfypgerukf khergfuoegrfyurgfirge jgreuyofrgiregvoifgr riygfepiygfreu;k frugfyrfbhrevf rrgfbreuobghfre rgeuherhbgerui freurehuregh ruogysfhurgiugwhlerghre rgiuyrge97grukbgr ker ruipuhrgeugregariyarga ;rskfglfsglgsfuifgryrgljs kjger;ugiergs hope this was helpful good luck!

How many millitiers are in 4.55 liters?

A zookeeper perdiceted that the wight of a newborn lion would be 2.8 pounds when the zoo’s lion gave birth ,the newbor. Weight 3.5 pounds what is the zookeeper’s percent error ? Round to nerds err percent

Answers

Answer:

20%

Step-by-step explanation:

3.5 - 2.8 = 0.7

0.7 ÷ 3.5 = 0.2

0.2 × 100 = 20

The answer is 20%.

Hope this helped.

Answer:

predicted wight=2.8

Actual wight = 3.5 pounds

(3.5-2.8)/3.5

=0.7/3.5 × 100

=100/5=20%

Answer: 20%

OAmalOHopeO

1/2 + 4 5/8 please help

Answers

Answer:

[tex]5 \frac{1}{8}[/tex]

Step-by-step explanation:

Remember that [tex]\frac{1}{2} = \frac{4}{8}[/tex], so we want to find [tex]\frac{4}{8} + 4 + \frac{5}{8} = 4 + \frac{9}{8}[/tex]. However, this is not in it's simplest form because [tex]\frac{9}{8}[/tex] should be [tex]1 \frac{1}{8}[/tex]. Therefore, the final answer is [tex]4+1+\frac{1}{8} = 5 \frac{1}{8}[/tex].

Answer:

5 1/8 correct answer to question

Given the similarity statement ΔJKL∼ΔNOP , what’s the corresponding angle of ∠J

Answers

9514 1404 393

Answer:

  ∠N

Step-by-step explanation:

J is the first letter listed in the left side of the similarity statement. The corresponding angle is the first letter listed in the right side of the similarity statement: ∠N.

__

Corresponding angles are listed in the same order. The similarity statement means ...

  ∠J≅∠N

  ∠K≅∠O

  ∠L≅∠P

Answer:

<J = <N

Step-by-step explanation:

JKL = NOP

We know the angles match

<J = <N

<K = <O

< L = <P

And we know

JK = NO

KL =  OP

JL = NP

⅗ Write the numerator and denominator of each of the following rational numbers​

Answers

Answer:

1 3 5 7 9 11

Step-by-step explanation:

same like this do the question the answer will come

Please help, I’m not sure about this question.

Answers

First set F equal to C and set it up as a system of equations

F=C

C=5/9*(F-32)

now plug F in for C and solve for F

F=5/9*(F-32)
9F/5=F-32
9F/5-F=-32
4F/5=-32
F/5=-8
F=-40

Find an equation of the line that is the perpendicular bisector of the line segment joining the points (6,2) and (18,6)

Answers

Answer:

y= -3x +40

Step-by-step explanation:

Properties of perpendicular bisector:

• perpendicular to the given line

• cuts through the center of the given line

The equation of a line can be written in the form of y=mx +c, where m is the gradient and c is the y -intercept.

Let's find the gradient of the given line first.

[tex]\boxed{gradient = \frac{y1 - y2}{x1 - x2} }[/tex]

Gradient of given line

[tex] = \frac{6 - 2}{18 - 6} [/tex]

[tex] = \frac{4}{12} [/tex]

[tex] = \frac{1}{3} [/tex]

The product of the gradients of perpendicular lines is -1.

m(⅓)= -1

m= -1(3)

m= -3

Substitute m= -3 into the equation:

y= -3x +c

To find the value of c, substitute a pair of coordinates in which the perpendicular bisector passes through into the equation. Since perpendicular bisectors passes through the center of the segment, we can find the point in which the perpendicular bisector passes through using the mid- point formula.

[tex]\boxed{midpoint = ( \frac{x1 + x2}{2} , \frac{y1 + y2}{2} )}[/tex]

Midpoint

[tex] = ( \frac{6 + 18}{2} , \frac{6 + 2}{2} )[/tex]

[tex] = ( \frac{24}{2} , \frac{8}{2} )[/tex]

[tex] = (12,4)[/tex]

y= -3x +c

when x= 12, y= 4,

4= -3(12) +c

4= -36 +c

c= 4 +36

c= 40

Thus, the equation of the perpendicular bisector is y= -3x +40.

Denver's elevation is 5280 feet above sea level. Death Valley is -282 feet. Is Death Valley located above sea level or below sea level???
(plz answer, due date is semtemper)

Answers

9514 1404 393

Answer:

  below

Step-by-step explanation:

When signed numbers are used to represent elevation with respect to sea level, positive signs are used for values above sea level, and negative signs are used for values below sea level. The given elevation of Death Valley indicates it is 282 feet below sea level.

help !!!! what’s the solution

Answers

B=0,4

I solved for b

Please help!! Given the recursive formula shown, what are the first 4 terms of the sequence?

Answers

Answer:

C

Step-by-step explanation:

You start with 6 and add 7 every time

Can someone please help me with this problem? I tried inputting the numbers into the standard deviation equation but I did not get the right answer. Can someone please help me? Thank you for your time.

Answers

Answer:

97.8

Step-by-step explanation:

add together 97.3 +0.5

5-3x<7-2x. Find the range of the values x

Answers

[tex] 5-3x<7-2x\\\\5-7<-2x+3x\\\\-2<x\\\\\boxed{\sf{x>-2}}[/tex] 

[tex]\sf{   }[/tex]  [tex]\sf{   }[/tex]  [tex]\sf{   }[/tex]

Answer:

x>-2

Step-by-step explanation:

5-3x<2x+3x

5-7<-2x+3

-2<x

note the sign changes

therefore

x >-2

What relationship do the ratios of sin x° and cos y° share? A right triangle is shown with one leg measuring 12 and another leg measuring 5.

Answers

the answer is 273939.9040(sin30)

An electronics company wants to compare the quality of their cell phones to the cell phones from three of their competitors. They sample 10 phones from each of the four companies and count the number of defects for each phone. If ANOVA was used to compare the average number of defects, then the treatments would be defined as: ______.

Answers

Answer:

The treatment should be stated by the four companies,since it more interested in the quality among each of the companies to be compared.

Step-by-step explanation:

I need help with this​

Answers

Answer:

D

Step-by-step explanation:

The table gives us the squares of certain values, and can be used to find the square root of certain values as well. For example, if 6² = 36, we can say that √36 = 6. Given this information, we can say that √47.6 is 6.9, and √49 = 7. If we look at the square root graph (√x=y), we can see that as x goes up, y goes up, and when x goes down, y goes down.

Therefore, we can say that the square root of 48 is between 6.9 and 7. We don't know exactly where it is, as there is no formula given to find it, so what Gina can do is go through the values between 6.9 and 7.0 and look for √48

What is the slope of the line that contains these points?
х
-1
0
1
2
y
10
18
26
34
slope:

Answers

Answer:

8.

Step-by-step explanation:

The slope =

difference in y coordinates of 2 points / difference in coordinates of corresponding x coordinates.

So taking the first 2 points:

The slope =  (18-10) / 0 - (-1)

= 8/1

= 8.

This is confirmed by slope between the second and third points

slope = 26-18/ (1-0) = 8.

The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is 2630. Assume the standard deviation is$500 . A real estate firm samples 100 apartments. Use the TI-84 Plus calculator.a) What is the probability that the sample mean rent is greater than $27007?b) What is the probability that the sample mean rent is between $2450 and $2550? c) Find the 25th percentile of the sample mean. d) Would it be unusual if the sample mean were greater than $26457?e) Do you think it would be unusual for an individual to have a rent greater than $2645? Explain. Assume the variable is normally distributed.

Answers

Answer:

a) 0.0808 = 8.08% probability that the sample mean rent is greater than $2700.

b) 0.0546 = 5.46% probability that the sample mean rent is between $2450 and $2550.

c) The 25th percentile of the sample mean is of $2596.

d) |Z| = 0.3 < 2, which means it would not be unusual if the sample mean was greater than $2645.

e) |Z| = 0.3 < 2, which means it would not be unusual if the sample mean was greater than $2645.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

If |Z|>2, the measure X is considered unusual.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $2630. Assume the standard deviation is $500.

This means that [tex]\mu = 2630, \sigma = 500[/tex]

Sample of 100:

This means that [tex]n = 100, s = \frac{500}{\sqrt{100}} = 50[/tex]

a) What is the probability that the sample mean rent is greater than $2700?

This is the 1 subtracted by the p-value of Z when X = 2700. So

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

By the Central Limit Theorem

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{2700 - 2630}{50}[/tex]

[tex]Z = 1.4[/tex]

[tex]Z = 1.4[/tex] has a p-value 0.9192

1 - 0.9192 = 0.0808

0.0808 = 8.08% probability that the sample mean rent is greater than $2700.

b) What is the probability that the sample mean rent is between $2450 and $2550?

This is the p-value of Z when X = 2550 subtracted by the p-value of Z when X = 2450.

X = 2550

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{2550 - 2630}{50}[/tex]

[tex]Z = -1.6[/tex]

[tex]Z = -1.6[/tex] has a p-value 0.0548

X = 2450

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{2450 - 2630}{50}[/tex]

[tex]Z = -3.6[/tex]

[tex]Z = -3.6[/tex] has a p-value 0.0002

0.0548 - 0.0002 = 0.0546.

0.0546 = 5.46% probability that the sample mean rent is between $2450 and $2550.

c) Find the 25th percentile of the sample mean.

This is X when Z has a p-value of 0.25, so X when Z = -0.675.

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]-0.675 = \frac{X - 2630}{50}[/tex]

[tex]X - 2630 = -0.675*50[/tex]

[tex]X = 2596[/tex]

The 25th percentile of the sample mean is of $2596.

Question d and e)

We have to find the z-score when X = 2645.

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{2645 - 2630}{50}[/tex]

[tex]Z = 0.3[/tex]

|Z| = 0.3 < 2, which means it would not be unusual if the sample mean was greater than $2645.

degree and classification of 4x^2+32x+63?
nvm its quadratic trinomial

Answers

Answer:

Pertaining to the mathematical expression conveyed, the answer to such proposed interrogate is acknowledged as the following:

Degree: 2nd degree term.

Classification: Quadratic trionomial.

Step-by-step explanation:

Evaluating the Degree:

The degree is acknowledged as the predominating term adjacent to a base of a peculiar value that denotes the particular allocation within a polynomial.

4x^2 has the highest degree of 2.

32x has the degree of one, being that x individually is x^1.

Since polynomials are defined by the term in which obtains the greatest degree, ^2 is referred to as quadratic, whereas ^3 is cubic, ^4…

Classification Evaluation:

Such could be determined by evaluating for the quantity of terms present within the mathematical expression or statement.

4x^2 is the first term.

32x is the second term.

63 is the third term (considered a constant).

Thus, the correct answer is a quadratic trinomial.

*I hope this helps.

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