Suppose the distribution of heights of a group of 400 children is normal, with a mean of 100 centimeters and a standard deviation of 20 centimeters. About how many of these children are taller than 100 centimeters?
A) 272
B) 50
C) 400
D) 336
E) 200

Question

Quizplus · Accepted Answer

In a normal distribution, the mean divides the distribution in half, so approximately 50% of the values lie above the mean. Since there are 400 children, about 50% of 400, which is 200 children, are taller than 100 centimeters.

Suppose the Distribution of Heights of a Group of 400