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Mean IQ of a large number of children of age 14 was 100 and the standard deviation 16. assuming that the distribution was normal find:

Mean IQ of a large number of children of age 14 was 100 and the standard deviation 16. assuming that the distribution was normal find:

1)what percentage of the children had IQ under 80.

2)between what limits IQ's of the middle 40% of the children lay.

3)what percentage of the children had IQ within range 1.96

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