Assume a normal distribution of height scores, with a mean of 68" and a standard deviation of 3", then
A) 68% of the cases must fall between 65" and 71"
B) 50% of the cases must fall below 68"
C) 68% of the cases must fall at exactly 68"
D) a and b, but not c

Question

Quizplus · Accepted Answer

A) and B) are correct based on the properties of a normal distribution. 68% of the data falls within one standard deviation of the mean (65" to 71"), and 50% of the data falls below the mean in a symmetric distribution. C) is incorrect because 68% of cases do not fall at exactly one point in a continuous distribution.

Assume a Normal Distribution of Height Scores, with a Mean