statistics

Suppose that IQ scores have a bell-shaped distribution with a mean of 95
95
and a standard deviation of 18
18
. Using the empirical rule, what percentage of IQ scores are at least 149
149
? Please do not round your answer.

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  2. 👎 0
  3. 👁 1,218
  1. 149 - 95 = 54 ... 54 / 18 = 3

    what percentage of values is at least 3 standard deviations above the mean?

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    2. 👎 0
  2. Answer: 15%

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