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The number of sales made yesterday by a sample of 30 salesmen are given in the following frequency distribution table. Determine the variance and standard

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The number of sales made yesterday by a sample of 30 salesmen are given in the following frequency distribution table. Determine the variance and standard deviation. All formulae and computations must be shown. Number of Sales Number of Salesmen 0 #WNH 1 4 8 10 7 n=30 (6 marks)

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