Write down the median weight of the males.

Calculate the interquartile range.

Estimate the number of males who weigh between $61$ kg and $66$ kg.

Estimate the mean weight of the lightest $40$ males.

$61$ kg     (A1)     (C1)

[1 mark]

$66 - 52$     (A1)
$= 14$     (A1)(ft)     (C2)

Note: Award (A1) for identifying quartiles, (A1)(ft) for correct subtraction of their quartiles.

[2 marks]

$20$     (A1)     (C1)

[1 marks]

$\frac{{49.5 \times 20 + 56.5 \times 20}}{{40}}$     (M1)

Note: Award (M1) for multiplication of midpoints by frequencies.

$= 53$ kg     (A1)     (C2)

[2 marks]

Question 14 parts a and b were well done.

Question 14 parts a and b were well done.

Parts c and d were omitted or incorrectly answered more frequently than any other question on the exam paper.

Parts c and d were omitted or incorrectly answered more frequently than any other question on the exam paper.