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 80% 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

In a normal distribution, about 80% of the data falls within approximately 1.28 standard deviations from the mean. Assuming a mean IQ of 100 and a standard deviation of 15, the range is approximately 80 to 120.

You Are Looking at a Normal Distribution of IQ Scores