2. The amount of time a bank teller spends with each customer has a normally distributed population with a mean = 3.1 minutes and Standard deviation of = 0.40 minutes. If a random sample of 16 customers is selected, (i) What is the probability that the average time spent per customer will be at least 3 minutes? (ii) What is the probability that the average time spent with a customer is between, 3 minutes and 3.5 minutes