Find the mean of marks obtained by 20 students in a class test (out of 50). 25, 40, 15, 16, 28, 39, 41, 22, 28, 30, 36, 40, 30, 18, 22, 32, 48, 32, 38, 40.

The direct method for calculating the mean requires dividing the sum of all values by the total count. Adding the marks 25, 40, 15, 16, 28, 39, 41, 22, 28, 30, 36, 40, 30, 18, 22, 32, 48, 32, 38, and 40 gives a total of 620. Dividing this total by the 20 students gives a mean of 31.

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