S5 2003 2 Edexcel

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Identical to S5 January 2006 4 Edexcel with slightly different numbers.

(ai)

Probability is instead:

\displaystyle \mathrm P(X = 8) = \binom {8 - 1} {2 - 1} (0.12)^2 (1 - 0.12)^6 = 0.0468 \text { (4dp)}

(aii)

Instead equal to \dfrac 3 {0.12} = 25

(b)

Unchanged

©

Unchanged, except the conclusion is now \dfrac 1 3 > 0.12 so Mary has a higher probability of winning a coconut.