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1. The median of the given datas are obtained as follows:

(i) Median The middle-most value in the arrangement of raw-data is in either ascending order or descending order.
 Median = value of the th term where n is odd.

Median = average of th value, if n is even.
(ii) Also

2. The cumulative frequency of a class is the frequency obtained by adding the frequencies of all the classes preceding the given class.

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