The manager of a restaurant believes that waiters and waitresses who introduce themselves by telling customers their names will get larger tips than those who don't. In fact, she claims that the average tip for the former group is 17% while that of the latter is only 13%. If tips are normally distributed with a standard deviation of 8%, what is the probability that in a random sample of 11 tips recorded from waiters and waitresses who introduce themselves and 11 tips from waiters and waitresses who don't, the mean of the former will exceed that of the latter?

Probability =