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merits and demerits of index number
The measures of central tendency are mean, median, and mode. The merits of mean are that it is easily calculated and easy to understands. Demerits are that it may be theoretical and cannot be used for qualitative date.
Mean median mode
statistics helps in gives a well understanding and correct explanation of a phenomenon of nature
histogram has several merits. one is it is good graphical representation of scores for better understanding. it is basically used for comparing scores.