. The table below shows the distributions of marks scored by some students in an examination. Marks (%) 60-64 65-69 70-74 75-79 80-84 85-89 90-94 95-99 Frequency 2 3 6 11 8 7 2 1 Using an assumed mean of your choice or otherwise, calculate; correct to two decimal places the: (a) mean (b) standard deviation; for the distribution.
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