7 The numbers of chocolate bars sold per day in a cinema over a period of 100 days are summarised in the following table.
| Number of chocolate bars sold | \(1 - 10\) | \(11 - 15\) | \(16 - 30\) | \(31 - 50\) | \(51 - 60\) |
| Number of days | 18 | 24 | 30 | 20 | 8 |
- Draw a histogram to represent this information.
\includegraphics[max width=\textwidth, alt={}, center]{3ada18de-c4f7-4049-9032-46b796be83c3-12_1203_1399_833_415} - What is the greatest possible value of the interquartile range for the data?
- Calculate estimates of the mean and standard deviation of the number of chocolate bars sold.
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