# 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 [removed] C. -0.53 [removed] D. 0.53

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

 [removed] A. -0.39 [removed] B. -1.03 [removed] 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) [removed] C. (–1.645, 1.645) [removed] 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. z = 0.42 [removed] 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 [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 [removed] B. 1.52 [removed] 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%?

 [removed] A. \$28,775 [removed] B. \$30,600 [removed] C. \$45,225 [removed] 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 [removed] C. \$5180 [removed] 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

 [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 [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