alleryGroup sizes are in ratio 2:3:5; means are 18,24,30. Overall mean?
A25.2
B25.8
C24.0
D26.4
Answer & Solution
Correct answer: B. 25.8
Weighting by group sizes gives (2 × 18 + 3 × 24 + 5 × 30) ÷ 10 = 25.8.
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