# Probability Percentages

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On standard IQ tests, the mean is 100, with a standard deviation of 15. The results are very close to fitting a normal curve. Suppose an IQ test is given to a very large group of people. Find the percent of those people

whose IQ scores are as follows.

More than 130

Less than 85

Between 85 and 115

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#### Solution Preview

mu = 100, sigma = 15; z = (x - mu)/sigma

(a) z = (130 - 100)/15 = ...

#### Solution Summary

A complete, neat and step-by-step solution is provided with regards to probability percentages.

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