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Question

During a medical check-up, the number of heartbeats per minute of 30 patients were recorded and summarized as follows:


Number of heartbeats per minute65−6868−7171−7474−7777−8080−8383−86
Number of patients2438742


Find the mean heartbeats per minute for these patients, choosing a suitable method.

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Solution

Using Direct method, the given data is shown as follows:

Number of heartbeats per minuteNumber of patients
(fi)
Class mark (xi)fixi
65−68266.5133
68−71469.5278
71−74372.5217.5
74−77875.5604
77−80778.5549.5
80−83481.5326
83−86284.5169
Totalfi=30 fixi=2277


The mean of given data is given by

¯x=fixifi

=227730=75.9

​Thus, the mean heartbeats per minute for these patients is 75.9.


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