Calculate the mean deviation (using median) from the following data. Size of items 6 7 8 9 10 11 12 Frequency 3 6 9 13 8 5 4

Question: For a group of 50 male workers, the mean and standard deviation of their weekly wages are Rs. 63 and Rs. 9 respectively. For a group of 40 female workers these are Rs. 54 and Rs. 6, respectively. Find the standard deviation (SD) for the combined group of 90 workers.

Solution:

Solution of mean and sd

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