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The amount of time a bank teller spends with each customer has a population mean μ=...

The amount of time a bank teller spends with each customer has a population mean μ= 3.10 and a standard deviation σ =0.40 minute. If you select a random sample of 20 customers

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  1. What is the probability that the mean time spent per customer is at least 5 minutes?

  2. There is an 85% chance that the sample mean is below how many minutes?

  3. What assumption must you make in order to solve (a) and (b)?

  4. If you select a random sample of 75 customers, there is an 85% chance that the sample mean is below how many minutes?

  5. Is the sample selected in section ( d ) normally distributed ? Why?

Math   Statistics-And-Probability   
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