9709 P53 - Nov 2023 - Q4
2422
The weights, x kg, of 120 students in a sports college are recorded. The results are summarised in the following table.
| Weight (x kg) | x ≤ 40 | x ≤ 60 | x ≤ 65 | x ≤ 70 | x ≤ 85 | x ≤ 100 |
|---|---|---|---|---|---|---|
| Cumulative frequency | 0 | 14 | 38 | 60 | 106 | 120 |
Calculate estimates for the mean and standard deviation of the weights of the 120 students.
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