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The Wechsler Adult Intelligence Scale (WAIS) is the most common "IQ test." The scale of scores...

The Wechsler Adult Intelligence Scale (WAIS) is the most common "IQ test." The scale of scores is set separately for each age group and is approximately normal, with mean 100 and standard deviation 15. People with WAIS scores below 70 are generally considered eligible to apply for Social Security disability benefits. By this criterion, what percent of adults are in this IQ category?

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Answer #1

Solution :

Given that ,

mean =   = 100

standard deviation = = 15

P(X< 70) = P[(X- ) / < (70 - 100) /15 ]

= P(z < -2)

Using z table

= 0.0228

=2.28% of adults are in this IQ category

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