Astudy of queues to pay in cash registers at supermarket

A study of queues to pay in the cash registers at a supermarket showed that during the busiest hour the average number of customer waiting to pay is 4. What is the probability that during that period:
1. There are no customers waiting?
2. Four customers are waiting in the line?
3. Four or less customers are waiting in the line?
4. Four or more customers are waiting?

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A random sample of 49 selected from the population with : a random sample of 49 selected from a population with a standard deviation of 14 yielded a mean 125. the mean and the

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Assume a random sample of 49 is selected from population : suppose a random sample of 49 is selected from a population with a standard deviation of 14. if the sample mean is 125

Astudy of queues to pay in cash registers at supermarket : a study of queues to pay in the cash registers at a supermarket showed that during the busiest hour the average

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