Question

average marks of 18 girls and 12 boys are 30 and 38 then find average marks of whole class.

Answer 1

Required average marks of whole class =33.2
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Answer 2

Given:

Average marks of 18 g-irls=30

Average marks of 12 boys=38

To find:

The average marks of the whole class

Solution:

The average marks of the whole class are 33.2.

We can find the marks by following the given steps-

We know that the average marks can be obtained by dividing the total marks by the number of students.

Let the sum of marks of the 18 g-irls be G.

Similarly, let the sum of marks of the 12 boys be B.

Now, the average marks of g-irls=Sum of marks of g-irls/Number of g-irls

We are given that the average marks of 18 g-irls are 30.

On putting the values,

30=G/18

30×18=G

540=G

The average marks of 12 boys=Sum of marks of boys/ Number of boys

We are given that the average marks of 12 boys are 38.

On putting the values,

38=B/12

38×12=B

456=B

Now to calculate the average marks of the whole class, we need to add the marks of boys and g-irls.

The total marks of the entire class=Marks of g-irls+marks of boys

=540+456

=996

Total number of students in the class=number of g-irls+number of boys

=18+12

=30

The average of the whole class=996/30

=33.2

Therefore, the average marks of the whole class are 33.2.