GCSE Maths

Averages Answers

Their scores: 55, 69, 83, 78, 49, 53, 90, 61, 83, 75

Mean = total sum ÷ number of quantities = 696 ÷ 10 = 69·6

Median: first put them in numerical order:
49, 53, 55, 61, 69, 75, 78, 83, 83, 90

Identify the one(s) in the middle: 69 and 75

Find the (mean) average of these: 69 + 75 / 2 = 72

Mode: there are only two results the same: 83

Range = biggest number - smallest number
= 90 - 49 = 41


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