The income of a group of 10,000 persons was found to be normally distributed with mean equal to Rs. 750 and standard deviation equal to Rs. 50. What was the lowest income among the richest 250 persons?
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The monthly incomes of a group of 10,000 persons were found to be normally distributed with mean equal to 15,000 and standard deviation equal to 1000. What is the lowest income among the richest 250 persons?
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