suppose we have a walk-in outpatient clinic for adults and special services for the elderly. We know the probability that a randomly arriving patient...

suppose we have a walk-in outpatient clinic for adults and special services for the elderly. We know the probability that a randomly arriving patient is elderly is p=.40. Of the next 8 patients, 1.) what is the probability 2 patients will be elderly? 2.) probability 2 or fewer patients will be elderly? 3.) probability more than 2 will be elderly? 4.) expected number of elderly patients to arrive out of 8?