Question: (two points) I developed an achievement test and normalized it on people throughout the country over a year. My test has scores that are normally

(two points) I developed an achievement test and normalized it on people throughout the country over a year. My test has scores that are normally distributed with a mean of 100 and a standard deviation of 9.

a.Find the probability that a randomly selected adult has IQ < 115

The probability of an IQ score being less than 115 is 0.6915.

b.Find the probability that a randomly selected adult has IQ > 90

c.Find P_30, which is the IQ score at the 30th percentile.

d.What percentage of adults have scores between 91 and 109?

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