(a(i))[2]
Find the probability that Tamar wears red socks on any day when he is at work.
(a(ii))[3]
Given that Tamar is not wearing red socks at work, find the probability that he is wearing a grey suit.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
Whenever Tamar goes to work, he either wears a blue suit with probability $0.6$ or a grey suit with probability $0.4$. If his suit is blue, the probability that he wears red socks is $0.2$. If his suit is grey, the probability that he wears red socks is $0.32$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The sum of two two-factor products, $0.6 \times a + 0.4 \times b$ (for example $0.6 \times 0.2 + 0.4 \times 0.32$)” …
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