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The WAIS test is an IQ test for the population of young adults (20—34 age group)....

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.

PLEASE SHOW YOUR WORK

  1. What proportion of young adults has a WAIS score is above 140.

  2. What proportion of young adults has a WAIS score between 90 and 120.

  3. Compute the interquartile range (IQR) of the WAIS scores.

  4. Find the 99-th percentile of the distribution of WAIS scores.

Math   Statistics-And-Probability   
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