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Question - Mean of Grouped Data

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Question

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

 

Number of heart beats per minute65 − 6868­ − 7171 −7474 − 7777 − 8080 − 8383 − 86
Number of women2438742

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