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4. Forthe following data: 64 33 45 49 32 31 69 53 42 67 57 36 76 58 78, calculate: a. mean and median for

4. Forthe following data: 64 33 45 49 32 31 69 53 42 67 57 36 76 58 78, calculate: a. mean and median for grouped data b. variance and standard deviation

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