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The daily demand for petrol at a garage is normally distributed with a mean of 20000 litres and a standard deviation of 7200 litres. What is the probability that the demand in any one day is:

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greater than 25000 litres?

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greater than 17000 litres?

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between 20000 and 25000 litres?

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between 30000 and 35000 litres?

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