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Find $\mu$.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
The masses, in grams, of onions in a supermarket are normally distributed with mean $\mu$ and standard deviation $22$. The probability that one randomly selected onion has a mass above $195$ grams is $0.128$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “By standardising to get $z=1.136$, e.g. $1.136=\dfrac{195-\mu}{22}$” …
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