I need help with this question:

If 15 patients are seen uin a day and it is known that, on average, 20% of patients attending have this illness, calculate the probability that more than 3 of them will test positive for the disease.

b) Of those 15 patients, 5 are over 35 years of age and 10 are 35 years of age or under. Then, 2 are selected at random to be interviewed about their lifestyke with the intention of finding out more about the risk factors in their lives. Calculate the probability that one of these is in the over 35 age category and the other in the 35 years or under group.

Please

Question

I need help with this question:

If 15 patients are seen uin a day and it is known that, on average, 20% of patients attending have this illness, calculate the probability that more than 3 of them will test positive for the disease.

b) Of those 15 patients, 5 are over 35 years of age and 10 are 35 years of age or under. Then, 2 are selected at random to be interviewed about their lifestyke with the intention of finding out more about the risk factors in their lives. Calculate the probability that one of these is in the over 35 age category and the other in the 35 years or under group.

Please