If raw scores ranging from 1 to 50 represented all the corresponding negative z-scores on the distribution, and raw scores ranging from 50 to 100 represented all the corresponding positive z-scores, what would be the total relative frequency of 50 to 100?
a. 1.00 c. 0.50
b. 0.75 d. 0.25
Question 2
If a class's scores are normally distributed, with a mean of 70 and a standard deviation of 10, what are the upper and lower limits of the middle 68 of the class?
a. 50 and 90 c. 60 and 80
b. 40 and 100 d. 32 and 68
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