The 10-year survival rate for bladder cancer is approximately 50%. If 20 people who have bladder cancer

Question:

The 10-year survival rate for bladder cancer is approximately 50%. If 20 people who have bladder cancer are properly treated for the disease, what is the probability that:
a. At least 1 will survive for 10 years?
b. At least 10 will survive for 10 years?
c. At least 15 will survive for 10 years?