Question 4:
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:
To find the class mark of each interval (xi), the following relation is used.
Class size, h, of this data = 3
Taking 75.5 as assumed mean (a), di, ui, fiui are calculated as follows.
From the table, we obtain
Therefore, mean hear beats per minute for these women are 75.9 beats per minute.
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