IQ scores on the WAIS test approximate a normal curve with a mean of 100 and a
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Question:
IQ scores on the WAIS test approximate a normal curve with a mean of 100 and a standard deviation of 15.
- the middle 95 percent? [Remember, the middle 95 percent straddles the line perpendicular to the mean (or the 50th percentile), with half of 95 percent, or 47.5 percent, above this line and the remaining 47.5 percent below this line.]
- the middle 99 percent?
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