Se a standard normal table to find the z-score that corresponds to

Question 1 Provide an appropriate response.
Use a standard normal table to find the zscore that corresponds to the cumulative area of 0.7019.

[removed]

A.

0.835

[removed]

B.

-0.835

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C.

-0.53

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D.

0.53

 

Question 2  Provide an appropriate response   Find the zscore that has 84.85% of the distribution’s area to its right.

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A.

-0.39

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B.

-1.03

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C.

0.39

[removed]

D.

1.03

 

Question 3  Provide an appropriate response Find the zscores for which 90% of the distribution’s area lies between z and z.

[removed]

A.

(0.99, 0.99)

[removed]

B.

(2.33, 2.33)

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C.

(1.645, 1.645)

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D.

(1.96, 1.96)

 

Question 4  Provide an appropriate response.Assume that the heights of women are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. If 100 women are randomly selected, find the probability that they have a mean height greater than 63.0 inches.

[removed]

A.

0.9918

[removed]

B.

0.0082

[removed]

C.

0.2881

[removed]

D.

0.8989

Question 5 Provide an appropriate response.
Assume that blood pressure readings are normally distributed with a mean of 115 and a standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be less than 117.

[removed]

A.

0.0062

[removed]

B.

0.8615

[removed]

C.

0.8819

[removed]

D.

0.9938

 

Question 6  Provide an appropriate response.
Find the zscore that corresponds to the given area under the standard normal curve.

 

[removed]

A.

= 0.42

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B.

z=0.40

 

Question 7  Provide an appropriate response.The scores on a mathematics exam have a mean of 70 and a standard deviation of 5. Find the xvalue that corresponds to the zscore 2.33.

[removed]

A.

72.3

[removed]

B.

58.4

[removed]

C.

75.0

[removed]

D.

81.7

Question 1  Provide an appropriate response.
For the standard normal curve, find the zscore that corresponds to the 90th percentile.

[removed]

A.

1.28

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B.

1.52

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C.

0.28

[removed]

D.

2.81

 

Question 2  Provide an appropriate response.
Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $37,000 and a standard deviation of $5000. What is the cutoff salary for teachers in the bottom 10%?

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A.

$28,775

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B.

$30,600

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C.

$45,225

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D.

$43,400

 

Question 3  Provide an appropriate response.Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $29,000 and a standard deviation of $2000. What is the cutoff salary for teachers in the top 10%?

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Question 4  Provide an appropriate responseFind the zscore that is greater than the mean and for which 70% of the distribution’s area lies to its left.

[removed]

A.

0.47

[removed]

B.

0.81

[removed]

C.

0.53

[removed]

D.

0.98

 

Question 5  Provide an appropriate response.
Find the zscore that has 84.85% of the distribution’s area to its right.

[removed]

A.

-1.03

[removed]

B.

1.03

[removed]

C.

-0.39

[removed]

D.

0.39

 

Question 6  Provide an appropriate response.The average number of pounds of red meat a person consumes each year is 196 with a standard deviation of 22 pounds (Source: American Dietetic Association). If a sample of 50 individuals is randomly selected, find the probability that the mean of the sample will be greater than 200 pounds.

[removed]

A.

0.8815

[removed]

B.

0.0985

[removed]

C.

0.7613

[removed]

D.

0.9015

 

Question 7  Provide an appropriate response.
Find the zscore for which 99% of the distribution’s area lies between z and z.

[removed]

A.

(1.645, 1.645)

[removed]

B.

(2.33, 2.33)

[removed]

C.

(1.28, 1.28)

[removed]

D.

(2.575, 2.575)

 

Question 8  Provide an appropriate response.The distribution of room and board expenses per year at a fouryear college is normally distributed with a mean of $5850 and standard deviation of $1125. Random samples of size 20 are drawn from this population and the mean of each sample is determined. Which of the following mean expenses would be considered unusual?

[removed]

A.

none of these

[removed]

B.

$6180

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C.

$5180

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D.

$6350

Question 1  Provide an appropriate response. Use a standard normal table to find the zscore that corresponds to the 80th percentile.

[removed]

A.

2.41

[removed]

B.

1.405

[removed]

C.

0.84

[removed]

D.

0.2

 

Question 2  Provide an appropriate response.The average number of pounds of red meat a person consumes each year is 196 with a standard deviation of 22 pounds (Source: American Dietetic Association). If a sample of 50 individuals is randomly selected, find the probability that the mean of the sample will be less than 200 pounds.

[removed]

A.

0.9015

[removed]

B.

0.0985

[removed]

C.

0.7613

[removed]

D.

0.8815

 

Question 3  Provide an appropriate response.The scores on a mathematics exam have a mean of 70 and a standard deviation of 5. Find the xvalue that corresponds to the zscore 2.33.

[removed]

A.

81.7

[removed]

B.

75.0

[removed]

C.

58.4

[removed]

D.

72.3

 

Question 4 Provide an appropriate response.Assume that the heights of men are normally distributed with a mean of 69.5 inches and a standard deviation of 2.1 inches. If 36 men are randomly selected, find the probability that they have a mean height greater than 70.5 inches.

[removed]

A.

0.9005

[removed]

B.

0.8188

[removed]

C.

9.9671

[removed]

D.

0.0021

 

Question 5  Provide an appropriate response.Find the zscore for which 70% of the distribution’s area lies to its right.

[removed]

A.

0.47

[removed]

B.

0.98

[removed]

C.

0.81

[removed]

D.

0.53

 

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