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Question -

The following is the cummulative frequency distribution (of less than type) of 1000 persons each of age 20 years and above. Determine the mean age.[NCERT Exemplar]



Answer -

First, we make the frequency distribution of the given data and then proceed to calculate mean by computing class marks (xi), ui’s and fiui‘s as follows:
 
= 45 + 6.3 = 51.3
Thus, the mean age is 51.3 years.

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