Average mark secured by 10 boys is 60 and average mark secured by 20 girls 70. Find
the combined mean mark of boys and girls.
[Ans : 66.67]
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Answer:
comb mean =
mean1 n1 + mean2 n2 / n1+ n2
= (60×10)+(70×20)/10+20
=600+1400/30
= 66.666 or 66.67
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