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Find the probability that the number of houses with solar heating is fewer than $4$.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
In a particular country, $12\%$ of houses have solar heating, and $19$ houses are selected at random.
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This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “From any binomial term $^{19}C_x p^x (1-p)^{19-x}$, with $0 \le p \le 1$” …
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