Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
The times, $t$ minutes, needed by $150$ students to finish a particular challenge are set out in the cumulative frequency table below.
(a)[2]
Draw a cumulative frequency graph to represent the data.
(b)[2]
$24\%$ of the students take $k$ minutes or longer to complete the challenge. Use your graph to estimate the value of $k$.
(c)[6]
Calculate estimates of the mean and the standard deviation of the time needed to complete the challenge.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “At least $4$ accurately plotted points with correct scales” …