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Question -

If the arithmetic mean of the data given below is 28, find (a) the missing frequency and (b) the median of the series



Answer -

(a) Let the missing frequency br f1.
Arithmetic Mean = 28
So, the Median class = Size of (N/2)th item = 50th term.
50th item lies in the 57th cumulative frequency and the corresponding class interval is 20-30.

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