9709 P62 - Jun 2015 - Q2
2428
120 people were asked to read an article in a newspaper. The times taken, to the nearest second, by the people to read the article are summarised in the following table.
| Time (seconds) | 1 – 25 | 26 – 35 | 36 – 45 | 46 – 55 | 56 – 90 |
|---|---|---|---|---|---|
| Number of people | 4 | 24 | 38 | 34 | 20 |
Calculate estimates of the mean and standard deviation of the reading times.
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