Q. 45.0( 3 Votes )

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

Answer :

We may find class mark of each interval (xi) by using the relation.

xi =

Class size of this data = 3

Now taking 75.5 as assumed mean (A), we may calculate di, ui, fiui as following:

Now we may observe from table that fi = 30, fiui = 4

Mean (X̅) = di + * h

= 75.5 + * 3

= 75.5 + 0.4 = 75.9

So mean of heart beat per minute of women are 75.9 beats per minute.

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