The intelligence quotients of 400 children have a mean value of
100 and a standard deviation...
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The intelligence quotients of 400 children have a mean value of100 and a standard deviation of 14. Assuming that I.Q.’s arenormally distributed, determine the number of children likely tohave I.Q.’s of between
(a) 80 and 90,
(b) 90 and 110 and
(c) 110 and 130.
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Given 100 14We convert to standard normal asPX x P Z x aP80 X 90 P X 90 P X 80 P Z 90 100 14 P Z 80 100 14 P Z 07143
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