The histogram below summarises the times, in minutes, that $190$ people needed to finish a race.
(a(i))[1]
Show that $75$ people took between $200$ and $250$ minutes to complete the race.
(a(ii))[6]
Calculate estimates for the mean and standard deviation of the times for the $190$ people.
(a(iii))[1]
Explain why the answers in part (ii) are estimates.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Number of people $=1.5\times50=75$” …
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