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A busy restaurant in the city centre has measured the wait time between the customer giving their food order and the customer receiving their food. The wait time for each customer follows a normal distribution with a population mean (μ) of 23 minutes and a standard deviation (σ) of 3 minutes.

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What is the probability that a randomly selected customer will wait less than 15 minutes to receive their food?

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What is the probability that a randomly selected customer will wait between 15 to 25 minutes to receive their food?

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If the restaurant serves 500 customers in a week, how many can be expected to receive their food in less than 15 minutes ( give your answer to rounded whole number).

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