Question

Class A has 28 pupils and class B has 8 pupils.

Both classes sit the same maths test.
The mean score for class A is 34.
The mean score for class B is 78.
What is the mean score (rounded to 2 DP) in the maths test across both classes?

Answer 1

43.78

Explanation:

In this case, the formula for mean can be as followed:

`mean = (sum \: of \: all \: student \: scores)/(number \: of \: students)`

Let the sum of all student scores for class A and class B be A and B respectfully,

For Class A,

A/28 = 34

A/28 = 34A = 952

For Class B,

B/8 = 78

B/8 = 78B = 624

Now to find the mean score of both classes using the same formula,

Mean = (952+624)/(28+8)

= 43.77777777777778

≈ 43.78