Weighted mean (Edexcel GCSE Statistics): Flashcards
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Why convert marks to percentages first?
Why convert marks to percentages first?
To make different totals comparable for averaging
Write the weighted mean formula
Write the weighted mean formula
x̄ = Σ(wx) ÷ Σw
Calculate Mr Smith's weighted mean (7,9,8 weights1,2,2)
Calculate Mr Smith's weighted mean (7,9,8 weights1,2,2)
8.2
Liz: convert 52/80 and 56/70 then average equally weighted
Liz: convert 52/80 and 56/70 then average equally weighted
72.5%
Find weighted mean: values 3,4,5 with weights 1,2,3
Find weighted mean: values 3,4,5 with weights 1,2,3
26/6 = 4.333...
When must you convert marks to percentages first?
When must you convert marks to percentages first?
When papers have different maximum marks
Mr Smith's weighted mean (scores 7,9,8; weights 1,2,2)
Mr Smith's weighted mean (scores 7,9,8; weights 1,2,2)
8.2