State which of the following sets of data are discrete.

(i) Speeds of cars travelling along a road.

(ii) Numbers of members in families.

(iii) Maximum daily temperatures.

(iv) Heights of people in a class measured to the nearest cm.

(v) Daily intake of protein by members of a sporting team.

The boxplot below shows the statistics for a set of data.

For this data set write down the value of

(i) the median

(ii) the upper quartile

(iii) the minimum value present

Write down three different integers whose mean is 10.

(ii) and (iv) are discrete.     (A1)(A1)

Award (A1)(A0) for both correct and one incorrect.

Award (A1)(A0) for one correct and two incorrect.

Otherwise, (A0)(A0).     (C2)

[2 marks]

(i) Median = 10     (A1)

(ii) Q₃ = 12     (A1)

(iii) Min value = 1 (±0.2)     (A1)     (C3)

[3 marks]

Any three different integers whose mean is 10 e.g. 9, 10, 11.     (A1)     (C1)

[1 mark]

a) Very few candidates obtained both marks for part (a), though a majority did gain one mark.

b) Most candidates answered (i) and (ii) well. Quite a few could not interpret the scale for (iii).

c) An easy mark for candidates. It was very disappointing to see some candidates getting this wrong.