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7. IQ scores are normally distributed with a mean of 100 and a standard deviation of...

7. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15 points.

a. Find the probability that a randomly selected person has an IQ less than 115.

b. Find the probability that a randomly selected person has an IQ above 60.

c. Find the 80th percentile for IQ scores.

d. Find the probability that 20 randomly selected person has an IQ less than 110.

e. What percentage of people have IQ scores between 60 and 85?

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