Let X denote the waiting time (in minutes) for a customer. An assistant manager claims that the average mu waiting time of the entire population of customers, is 3 minutes with standard deviation also 2 minutes The manager doesn't believe his assistant's claim, so he observes a random sample of 36 customers. The average waiting time for the 36 customers is 3.2 minutes What is the probability that the average of 36 customers is 3.2 minutes or more? Do you think that assistant manager's claim that the mean is 3 minutes is correct