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Posted by on Tuesday, February 14, 2012 at 8:26pm.

On standard IQ tests, the mean is 100 and the standard deviation is 13. The results are very close to fitting a normal curve. Suppose an IQ test is given to a very large group of people. Find the percent of people whose IQ score is between 61 and 139.

  • Statistics - , Wednesday, February 15, 2012 at 11:29am

    First of all, on standard IQ tests (e.g., WISC and WAIS), SD = 15, but I will go with your data.

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion between the two Z scores. Change to percentage.

  • Statistics - , Saturday, September 13, 2014 at 6:56pm

    136

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