Question 56

The mean of the marks scored by 12 students of a class is 67.4. If the mean of another class consisting of 15 students is ' 72.3, fmd their combined mean?

Solution

Total marks scored by first class is

=12×67.4=808.8.

and total marks scored by second class is

=15×72.3=1084.5.

So,total scored made by (15+12)=27 students is=(1084.5+808.8)=1893.3.

So, average score of them=1893.3/27=70.122.

A is correct choice.

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