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Determine the probability that a randomly selected car of this type has petrol consumption between 21.6 kilometres per litre and 28.7 kilometres per litre.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
The petrol consumption for one particular type of car follows a normal distribution with mean 24 kilometres per litre and standard deviation 4.7 kilometres per litre.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “By standardising the normal variable: $P\left(\frac{21.6-24}{4.7}<z<\frac{28.7-24}{4.7}\right)$” …
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