Question
What is the overall average of marks for all the
students if three groups consist of 45, 35, and 40 students with average marks of 40, 60, and 45, respectively?Solution
ATQ,
Required average = (45 × 40 + 35 × 60 + 40 × 45)/(45 + 35 + 40) = 5700/120 = 47.5
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