Higher June 2019 Paper 1R Q8

EdexcelHigherCurrent spec3 marksAverages (including IQR)

8 There are 10 people in a lift.
These 10 people have a mean weight of 79.2 kg.
3 of these people get out of the lift.
These 3 people have a mean weight of 68 kg.
Work out the mean weight of the 7 people left in the lift.

(3)

Scheme	Marks
10 × 79.2 (= 792) or 3 × 68 (= 204)	M1
(10 × 79.2 − 3 × 68) ÷ 7	M1
84	A1
	(3)
	(3 marks)