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Calculate the mean and standard deviation for the following table given the age distribution of a group of people: Age: 70-80 80-90 90-100 100-110 110-120

Calculate the mean and standard deviation for the following table given the age distribution of a group of people: Age: 70-80 80-90 90-100 100-110 110-120 120-130 130-140 No. of persons: 12 18 35 42 50 45 20

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