The following data relates to the number of successful sales made by the salesmen employed by large microcomputer firm in a particular quarter.
Number of Sales: 0-9 & 10-19 & 20-29 & 30-39 & 40-49 & 50-59
number of salesman: 1 & 14 & 23 & 21 & 15 & 6
Required;
i) Calculate the mean number of sales.
ii) Calculate the mode of sales.
iii) Calculate Median of sales.
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