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Thirty women were examined in a hospital...

Thirty women were examined in a hospital by a doctor and their of heart beats per minute were recorded and summarised as shown . Find the mean heart beats per minute for these wowen , choosing a suitable method .
`{:("Daily Number of heart beats /minute","Number of women"),(65-68,2),(68-71,4),(71-74,3),(77-80,7),(80-83,4),(83-86,5):}`

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The correct Answer is:
75.9
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