The Normal Distribution Has a Greater Percentage of Its Area

question 188

Multiple Choice

The normal distribution has a greater percentage of its area close to the mean and much less in the tails.
-Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test) . Find the probability that a randomly selected adult has an IQ between 90 and 120
(somewhere in the range of normal to bright normal) .

• A) 0.6227
• B) 0.6568
• C) 0.6014
• D) 0.6977

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