9709 P51 - Nov 2023 - Q4
2433
The times, to the nearest minute, of 150 athletes taking part in a charity run are recorded. The results are summarised in the table.
| Time in minutes | 101 – 120 | 121 – 130 | 131 – 135 | 136 – 145 | 146 – 160 |
|---|---|---|---|---|---|
| Frequency | 18 | 48 | 34 | 32 | 18 |
Calculate estimates for the mean and standard deviation of the times taken by the athletes.
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