Calculate the mean and standard deviation for the following distribution: Marks:, 20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90 No. of students:, 3, 6, 13, 15, 14, 5, 4
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20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80- 90 No. of students:, 3, 6, 13, 15, 14, 5, 4.
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