B1 (2) [12] Notes (a) M1 for a correct expression for Syy A1 for 218 (condone 218.0) (b) M1 for attempt at correct formula with their Syy (0) and given Sxx , Sxy in the correct places Condone missing “ −” for M1 −0.95 with no expression seen scores M1A0, awrt – ...
Words only is B0 (c) B1 writing or using Po(4.5)(Check their probs using tables if Po(4.5) is not seen) st 1 M1 writing 1– P(X ≤ 8 ) May be implied by sight of 1 – 0.9597 or for CR method: P( X ≤ 7 ) = 0.9134 or P(X ≤ 8 ) = 0.9597 ( NB may see P(X ...
6 June 2015 WST01 STATISTICS 1 Mark Scheme Question Scheme Marks 1. (a) F(4) 1 M1 2 1 4 k 1 k A1 16 (2) (b) 4 1 3 M1 e.g. P(X = 2) = F(2) – F(1) = 16 16 16 [x] 1 2 3 4 1 3 5 7 [ P X x ] 16 16 16 16 (0.0625) (0.1875)...