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CAIE A Level Mathematics 9709 · Representation of data

Representation of data: calculation question

4 marksChallenge

The following data are coded using the transformation y=x−4y = x - 4. The totals are: ∑y=0\sum y = 0 and ∑y2=90\sum y^2 = 90. The number of data points is n=10n = 10. Find the standard deviation of the original xx values.

  1. (a)

    Calculate the standard deviation of xx.

    [4]

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