Download The basic IQ test is a normal distribution with a... standard deviation of 15.

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The basic IQ test is a normal distribution with a mean of 100 and a
standard deviation of 15.
If someone scored an 83 what is their percentile rank?
If a person got a score of 112, what percentage of people scored higher?
If a person is considered to be a genius they score in the top 5%. What
score would a person have to get on the IQ test to be considered a
genius?