9709 P63 - Nov 2015 - Q6
2395
The heights to the nearest metre of 134 office buildings in a certain city are summarised in the table below.
| Height (m) | 21–40 | 41–45 | 46–50 | 51–60 | 61–80 |
|---|---|---|---|---|---|
| Frequency | 18 | 15 | 21 | 52 | 28 |
(i) Draw a histogram on graph paper to illustrate the data.
(ii) Calculate estimates of the mean and standard deviation of these heights.
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