If an IQ test is constructed to have a mean of 100 and a standard deviation of 16,approximately what percentage of scores falls between 84 and 116?
A) 34 percent
B) 95 percent
C) 68 percent
D) 50 percent

Question

Quizplus · Accepted Answer

Because the IQ test has a mean of 100 and a standard deviation of 16, we know that 68% of the scores fall within one standard deviation of the mean. Therefore, approximately 34% of scores are between the mean (100) and one standard deviation below the mean (100-16=84), and approximately 34% of scores are between the mean and one standard deviation above the mean (100+16=116). Adding these two percentages together gives us approximately 68%. Therefore, the correct answer is C) 68 percent.

If an IQ Test Is Constructed to Have a Mean