You are looking at a normal distribution of IQ scores. A friend thinks that the graph is really cool and wants to know between what two scores (above and below the mean) would about 50% of the people fall. You immediately say
A)85 and 115
B)80 and 120
C)90 and 110
D)80 and 100
E)you cannot tell from this graph

Question

Quizplus · Accepted Answer

The middle 50% of a normal distribution falls within approximately one standard deviation of the mean. For IQ scores, which have a mean of 100 and a standard deviation of 15, this range is from 85 to 115. However, since none of the options exactly match this, the closest option that represents a range around the mean that could contain approximately 50% of the distribution is 90 to 110.

You Are Looking at a Normal Distribution of IQ Scores