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Answer :
Final answer:
Approximately 2.28% of adults are developmentally disabled according to the WAIS criterion.
Explanation:
To find the percentage of adults who are developmentally disabled according to the Wechsler Adult Intelligence Scale (WAIS) criterion, we need to calculate the percentage of scores below 70 in a normal distribution with a mean of 100 and a standard deviation of 15.
First, we find the z-score for a score of 70: z = (70 - 100) / 15 = -2.
Next, we use a z-score table or calculator to find the percentage of scores that fall below -2, which is approximately 2.28%. Therefore, approximately 2.28% of adults are developmentally disabled according to the WAIS criterion.
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