For patients aged 81 to 90, the probability is .07 that a coronary bypass patient will die

Question:

For patients aged 81 to 90, the probability is .07 that a coronary bypass patient will die soon after the surgery.
(a) What is the expected number of operations until the first fatality?
(b) What is the probability of conducting 20 or more operations before the first fatality? Hint: Use the CDF.