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  1. S

    Data question

    A set of data has a mean of 4.25. When the outlier of 20 is removed, the mean changes to 3.2. How many scores are in the original data set?
  2. S

    Differentiation questions

    a) Differentiate y=x^2+bx+c, and hence find b and c, given that the parabola is tangent to the x-axis at the point (5,0) b) Differentiate y=x^2+bx+c, and hence find b and c, when x =3 the gradient is 5, and x=2 is a zero.
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