The Student Room Group
Right I have no idea what I'm talking about but if you require a weighted MEAN index value for those two items the calculation is:

(83Ă—114.7)+(36Ă—106.4)83+36=112.2\frac{(83 \times 114.7) + (36 \times 106.4)}{83 + 36} = 112.2 (1 d.p.)

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