How many people out of 100 have an IQ above 130?
A)two
B)five
C)10
D)15

Question

Quizplus · Accepted Answer

The IQ scale is designed so that the mean is 100 and the standard deviation is 15. An IQ of 130 is two standard deviations above the mean. According to the empirical rule (or 68-95-99.7 rule), approximately 95% of the population falls within two standard deviations of the mean, leaving 5% outside. Since an IQ of 130 is at the higher end, it represents roughly half of that 5%, which is 2.5%. Since the question asks for the number of people out of 100, we round to the nearest whole number, which is 2.

How Many People Out of 100 Have an IQ Above