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1. What can be claimed regarding a perfectly normal distribution?
a. Mean = Mode
b. Median = Mode
c. Mean = Median
d. All of the above
2. The price-to-earning ratio for companies in a specific industry is normally distributed.
In this industry, what can be concluded regarding a company with a price-to-earning zscore equal to 0?
a. The company's price-to-earning ratio is above average.
b. The company's price-to-earning ratio is below average.
c. The company's price-to-earning ratio is average.
d. Nothing can be concluded regarding the company's price-to-earning ratio.
3. What is the mean and standard deviation of a standard normal curve?
a. 0, 0
b. 0, 1
c. 1, 0
d. 1, 1
4. Assume the age of students in your class is normally distributed with a mean of 30
years and a standard deviation of 5 years. What is the probability that the age of a
randomly selected student from your class would be more than 35?
a. 84.1%
b. 68.2%
c. 47.7%
d. 15.9%
5. A student's score on a quiz was transformed to a z-score of - 1. What can be concluded
regarding the student's score?
a. above average
b. 84.1% of the class scored higher on the quiz
c. 68.2% of the class scored higher on the quiz
d. 49.85% of the class scored higher on the quiz
6. The price-to-earning ratio for companies in a specific industry is normally distributed.
What is the probability that a randomly selected company from this industry has a priceto-earning ratio between the industry mean and one standard deviation above this mean?
a. 68.2%
b. 34.1%
c. 13.6%
d. 2.15%
7. What is the mean and standard deviation of a distribution of T-scores?
a. 50, 0
b. 50, 1
c. 50, 10
d. 50, 21.06
8. What percent of scores fall between the mean and plus three standard deviations in a
standard normal curve?
a. 34.1%
b. 13.6%
c. 49.85%
d. 68.2%
9. What percent of scores fall between minus one standard deviation and plus one
standard deviation in a standard normal curve?
a. 34.1%
b. 13.6%
c. 49.85%
d. 68.2%
10. What percent of scores fall between the mean and negative one standard deviation in
a distribution of T-scores?
a. 34.1%
b. 13.6%
c. 49.85%
d. 68.2%