<PRE><B>Question 867291</B>
The mean IQ score of adults is 100 with a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 70 and 130.
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70 is 2 std below the mean
130 is 2 std above the mean
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Using Chybeshev you get::
At least (1-(1/2)^2)% = (1-0.25)% = 75% of the data is between 70 and 130.
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Cheers,
Stan H.
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