Question 1
Solve the problem.
Which of the following statements concerning areas under the standard normal distribution curve is/are true?
a. If a z-score is negative, the area to its right is greater than 0.5
b. If the area to the right of a z-score is less than 0.5, the z-score is negative.
c. If a z-score is positive, the area to its left is less than 0.5
◦ a, c
◦ a, b
◦ b, c
◦ a
Question 2
Solve the problem.
The area under the standard normal distribution curve between 1 and 2 is equal to 0.1359. Scores on a particular aptitude test are normally distributed with a mean of 100 and a standard deviation of 10. Which of the following are equal to 13.59%?
a. The percentage of scores between 120 and 130
b. The percentage of scores between 110 and 120
c. The percentage of scores between 80 and 90
d. The percentage of scores between 90 and 120
e. The percentage of scores between 90 and 110
◦ b, c
◦ b
◦ e
◦ a, b
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Problem