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20. Find the mean and standard deviation of the following data: (6 marks) Class Interval Frequency 1-5 2 6-10 5 1 1-1 5 2 16-20

20. Find the mean and standard deviation of the following data: (6 marks) Class Interval Frequency 1-5 2 6-10 5 1 1-1 5 2 16-20 1

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