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Thirty women were examined in a hospita...

Thirty women were examined in a hospital by a doctor and the number of heartbeats per minute were recorded and summarised as follows. Find the mean heartbeats per minute for these women, choose a suitable method.
`{:("Number of heartbeats per minute ",65-68,68-71,71-74,74-77,77-80,80-83,83-86),("Number of women "," "2," "4," "3," "8," "7," "4," "2):}`

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The correct Answer is:
`75.9`
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Thirty women were examined in a hospital by a doctor and their heart beats per minute were recorded and summarised as shown . Find the mean heart beats per minute for these women, choosing a suitable method.

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