The WAIS test is an IQ test for the population of young adults (20—34 age group).
The WAIS test scores normally distributed with a mean of 110 and a standard deviation of 25.
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What proportion of young adults has a WAIS score is above 140.
What proportion of young adults has a WAIS score between 90 and 120.
Compute the interquartile range (IQR) of the WAIS scores.
Find the 99-th percentile of the distribution of WAIS scores.
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