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11. The income of a group of 10000 persons was found to be normally distributed with mean Rs. 1750 pm. and standard deviation Rs. 50.

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11. The income of a group of 10000 persons was found to be normally distributed with mean Rs. 1750 pm. and standard deviation Rs. 50. Show that of this group 95% had income exceeding Rs. 1668 and only 5 \"/6 had income exceeding Rs. 1832. Also nd the lowest income among the richest 100

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