Question 4 - A-Level Maths

Exam Board	CAIE
Module	S1 (Statistics 1)
Year	2017
Session	June
Topic	Data representation
Type	Draw histogram from frequency table

4 The times taken, \(t\) seconds, by 1140 people to solve a puzzle are summarised in the table.

Time \(( t\) seconds \()\)	\(0 \leqslant t < 20\)	\(20 \leqslant t < 40\)	\(40 \leqslant t < 60\)	\(60 \leqslant t < 100\)	\(100 \leqslant t < 140\)
Number of people	320	280	220	220	100

On the grid, draw a histogram to illustrate this information.
\includegraphics[max width=\textwidth, alt={}, center]{7652f36c-59b5-4fcd-b17b-d796dc82aec0-05_812_1406_804_411}
Calculate an estimate of the mean of \(t\).