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AS Formula to be memorised

C1
General equation of a line y ­ y1 = m(x ­x1)

Gradient of a line joining two points m=

Midpoint of a line joining two points ( ,

Distance between two points

Gradient of normal = negative reciprocal of gradient of tangent


Roots of…

Page 2

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AS Formula to be memorised

S1

Mean of a set of numbers =


Standard Deviation of a set of numbers = =


Mean of a frequency distribution =



Standard Deviation of a frequency distribution =
=


Variance = (sd)2 =

Interpolation

Median = lower class boundary + widthofinterval



Discrete data…

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