Discussion:
The amount of time a bank teller spends with each customer is normally distributed with a mean of 3.10 minutes and a standard deviation of 0.40 minutes. (Use the z table)
If a random sample of 16 customers is selected from the bank, what is the probability that the average time spent per customer will be at least 3 minutes?
There is an 85 percent chance that the sample mean will be below how many minutes?