Class A has 8 pupils and class B has 10 pupils. Both classes sit the same maths test. The mean sco

Discussion in 'Calculator Requests' started by math_celebrity, Nov 17, 2018.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    Class A has 8 pupils and class B has 10 pupils. Both classes sit the same maths test. The mean score for class A is 55. The mean score for both classes is 76. What is the mean score (rounded to 1 DP) in the maths test for class B

    Mean of the sum equals the sum of the means.

    U(A + B) = U(A) + U(B)
    76 = 55 + U(B)

    Subtract 55 from each side, we get:
    U(B) = 21
     

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