OK, having been asked by a couple of peeps...here's my answers for OCR AS Level Mathematics A Paper 1 (Pure and Statistics) H230/01 June 20181) (i) a=27, b=3 (ii) c=-2, d=-1, e=22) (i) k=9/4 (ii) -2<x<33) (i) 30, 150, 210, 330 (ii) 20, 804) (i) (a) 2x 3 (b) x>-1.5 (ii) 3x (8/3)x^1.5 c5) (3n 1)^2 = 3(3n^2 2n) 1 and (3n 2)^2 = 3(3n^2 4n 1) 16 (i) sketch (ii) sketch with y-int = 0 and min pt at (3,0)7 (i) (a) c-a (b) 0.5(a c) (ii) O_B = c a therefore O_P = 0.5 O_B = 0.5 (a c)8) a=0, b=-10, c=59) (i) more representative (ii) no, school population may not be representative of UK10) (i) p=1/16 (ii) 39/6411 (i) independent sightings (ii) 0.318 (iii) 0.085412 P = 0.0139<2% reject H0 there is sufficient evidence that new method is successful13 (i) can compare proportions cannot compare sizes (ii) 80000 (iii) higher proportion of 0-17yrs olds in Rutland higher proportion of 18-29yr olds in Liverpool (iv) more babies to be born in Liverpool over next 10yrs youngsters in Rutland will have grown into next age range in 10yrs