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The income of a group of 10000 persons was found to be normally distributed with mean rs. 750 per month and a standard deviation of rs.50. show that of this group about 95% has income exceeding rs.668 and only 5% had income exceeding rs.832 (area between 750 and 668= 0.4495, area between 750 and 832 = 0.4495

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