An upscale hotel has been measuring the frequency with which customers try to check in to the hotel but find that their reserved rooms are unavailable. The hotel has gathered data and found that on average 18 guests are unable to check in because their rooms are not ready (with a standard deviation of 4 guests). What is the chance that more than 24 guests will be unable to check in for this reason? If the management is willing to tolerate 15 guests per night as the maximum number of guests inconvenienced in this way, what is the capability of this process?