4 The following histogram summarises the times, in minutes, taken by 190 people to complete a race.
\includegraphics[max width=\textwidth, alt={}, center]{df246a50-157b-49f7-bba0-f9b86960b8b9-2_1210_1125_1251_513}
- Show that 75 people took between 200 and 250 minutes to complete the race.
- Calculate estimates of the mean and standard deviation of the times of the 190 people.
- Explain why your answers to part (ii) are estimates.