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CAIE A Level Mathematics 9709 · Representation of data

Representation of data: calculation question

3 marksChallenge

For a set of 2020 values of xx, the coded values y=x−504y = \dfrac{x - 50}{ 4 } are used. It is given that ∑y=120\sum y = 120.

  1. (a)

    Find the mean of the original values of xx.

    [3]

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