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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

    Thanks
  3. S

    Differentiation questions

    so for part b) y'(x) = 2x+b when x = 3, the gradient is 5 So 5=2(3)+b 5=6 +b -1=b Sub x=3 and b = -1 into y=x^2+bx+c y=(3)^2+(-1)(3)+c y=6+c Then the second part y'(x) = 2x+b when x = 2, the gradient is 0...
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    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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