Question
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
Answer: Option B
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Required average = \(\left(\frac{55\times50+60\times55+45\times60}{55+60+45}\right)
\)
= \(\left(\frac{2750+3300+2700}{160}\right)\)
= \(\frac{8750}{160}\)
= 54.68
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