Q. 44.8( 4 Votes )

Thirty women were

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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