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The mean I.Q. of a group of children is 90 with a standard deviation of 20.

The mean I.Q. of a group of children is 90 with a standard deviation of 20. Assuming that I.Q. is norınally distributed, find the percentage of children with I.Q, over 100. (Given (0.5) = 0.6915, where O(x) is the cumulative distribution function of standard 'normal distribution.)

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