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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, choosing a suitable method.
| Number of hearbeats per minutes | \(65-68\) | \(68-71\) | \(71-74\) | \(74-77\) | \(77-80\) | \(80-83\) | \(83-86\) |
| Number of women | \(2\) | \(4\) | \(3\) | \(8\) | \(7\) | \(4\) | \(2\) |
Mean hearbeats per minute \(=\)
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