If the coefficient of correlation is a positive value, then the slope of the regression line
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I suppose you mean
, and if we multiply
by
we get
. Subtracting this from the numerator gives a remainder of
.
, and multiplying
by
gives
. Subtracting this from the previous remainder gives a new remainder of
.
has no remaining factors of
in it, so we're done, and
N is the number of leaflets so you just substitute the required number for N.
The cost of printing 2500 leaflets is <span>£</span>7925.