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Consider the grouped sample data to the bottom. a) Calculate the approximate mean of these sample data. b) Calculate the approximate standard deviation of these

Consider the grouped sample data to the bottom.

a) Calculate the approximate mean of these sample data.

b) Calculate the approximate standard deviation of these sample data.

Values Frequency 5_to_under_10 13 10_to_under_15 6 15_to_under_20 21 20_to_under_25 22 25_to_under_30 8

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