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The average weight of 16 boys in a class is 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average weight of all the boys in the class.
Answer & Solution
Correct Answer:
Option
C
Required mean
$$\eqalign{ & = \left( {\frac{{50.25 \times 16 + 45.15 \times 8}}{{16 + 8}}} \right) \cr & = \left( {\frac{{804 + 361.20}}{{24}}} \right) \cr & = \frac{{1165.20}}{{24}} \cr & = 48.55 \cr} $$
$$\eqalign{ & = \left( {\frac{{50.25 \times 16 + 45.15 \times 8}}{{16 + 8}}} \right) \cr & = \left( {\frac{{804 + 361.20}}{{24}}} \right) \cr & = \frac{{1165.20}}{{24}} \cr & = 48.55 \cr} $$
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