Misc 7 Show That General Solution Is X Y 1 A 1 X Y 2xy
1 x y2xy 1Xy 2xy 71 A can hit a target 4 times in 5 shots, B can hit it three times in 4 shots and C can hit it twice in 3 shots They fire at target if exactly two of them hit the target Then the chance that it is C who has missed is 6 4 4 (a) (c) (d) 13The coefficient for the collection of n pairs (x, y) of numbers in a sample is the number r The sign of the linear correlation coefficient indicates the direction of the linear relationship between x and y Its formula is r = (SS xy) / √ (SS xx * SS yy where, SS xx = ∑x 2 1/n (∑x) 2 SS xy = ∑xy
