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Numeracy Foundation June 2022 Unit 2 Q11

WJECFoundationCurrent spec5 marksAverages (including IQR)Time-Series

11. An engine normally runs at 100°C.
When the engine runs at 110°C or more, a warning light comes on.

A section of the temperature chart for the engine, from 12:00 to 16:00, is shown below.

Temperature of the engine (°C), from 95 to 115, against time from 12:00 to 16:00, with plotted points
(a)

How often was the temperature of the engine recorded?
Circle your answer. [1]

Every 5 minutes     Every 12 minutes     Every 15 minutes

Every \(2\frac{1}{2}\) minutes     Every 30 minutes

(b) At what time was it first recorded that the warning light had come on? [1]
(c) What was the range of the recorded temperatures of the engine between 12:00 and 16:00? [1]
(d)
(i)

Use the graph paper below to plot the recorded temperature of the engine at 12:00, 13:00, 14:00, 15:00 and 16:00 only. [1]

Blank graph paper: temperature of the engine (°C) from 60 to 120 against time from 12:00 to 16:00
(ii) Why is the graph you have drawn misleading? [1]