11. If the scores in a Probability and Statistics test are normally distributed with a mean of 31 and standard deviation of 4.5. What is the z-score for a score of 40? A. 1 B. 2 C. 2.5 D. 3
11. If the scores in a Probability and Statistics test are
A. 1
B. 2
C. 2.5
D. 3
12. Gracia, an ALS student, obtained a z-score of 1.35 in an achievement test that is normally distributed with a mean grade of 85 and standard deviation of. What was Garcia's grade in the achievement test?
A. 71.25
B. 78.25
C. 91.75
D. 94.65
13. In a normal distribution with a mean of 15 and standard deviation of 3, what does a z-score of -2 indicate?
A. It indicates that the score is equal to 9.
B. It indicates that the score is below the mean.
C. It indicates that the score is 9 less than the mean
D. It indicates that the difference between the score and the mean is 6.
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