Q. 44.2( 253 Votes )

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarised as follows. Find the mean heart beats per minute for these women, choosing a suitable method

Answer :

The above given data can be represented in the form of table as below:

Let the assumed mean for the given data be, a = 75.5
Now, mean of the deviation can be calculated as follows:

where, fi = frequency of the ith class
di = deviation from assumed mean of the ith class = xi - a


= 0.4

Mean can be calculated as follows:


= 0.4 + 75.5

= 75.9

Mean heartbeat for women = 75.9

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