A class has two section in one of which there are 40 students with an average age of 14.5 years. The average of the class is 14.2 years. If there are 32 students in the other section, then its average age is

13.7 years

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13.6 years

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13.5 years

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None of the above

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Solution

The correct option is A None of the above
Required average age
$= \frac{72 \times 14.2 - 40 \times 14.5}{32}$
$= \frac{442.4}{32} = 13.825$ years

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A class has two section in one of which there are 40 students with an average age of 14.5 years. The average of the class is 14.2 years. If there are 32 students in the other section, then its average age is

The correct option is A None of the aboveRequired average age =72×14.2−40×14.532=442.432=13.825 years

The correct option is A None of the above
Required average age
$= \frac{72 \times 14.2 - 40 \times 14.5}{32}$
$= \frac{442.4}{32} = 13.825$ years