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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 women, choosing a suitable method.

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\(\overline{x}= a+\frac{\Sigma f_id_i}{\Sigma f_i}\)

75.5 + \(\frac{12}{30 }\)

= 75.5 + 0.4 

= 75.9.

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