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The length of time it takes to fill an order at the canteen at Westminster Business...

The length of time it takes to fill an order at the canteen at Westminster Business School is normally distributed with a mean of 4.1 minutes and standard deviation of 1.3 minutes.

ii) What is the probability that the average waiting time for a random sample of ten customers is between 4.0 and 4.2 minutes?

iii) If the probability that the waiting time for a random sample of ten customers is greater than ɑ minutes is equal to 95%, what is the value of ɑ?

Math   Statistics-And-Probability   
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