Question

The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.

• A. $47.55$ kg
• B. $48$ kg
• C. $48.55$ kg
• D. $49.25$ kg

Answer 1

The correct option is C $48.55$ kg

Required average = $\left(\begin{array}{c}\frac{50.25\times 16+45.15\times 8}{16+8}\end{array}\right)$
= $\left(\begin{array}{c}\frac{804+361.20}{24}\end{array}\right)$
= $\frac{1165.20}{24}$
= 48.55