A supermarket manager boasts that the average customer waits no more than 10 minutes at the checkout counter. A dissatisfied customer decides to show that there is statistical evidence that the manager is wrong. She decides to perform a test with n = 100 customers and alpha = 0.05. Calculate the probability of erroneously concluding that the customer is not correct when in actual fact the average waiting time is 11.5 minutes. ( assume that SD = 5.)