A hospital will have one of its mechanical ventilators fail (i.e. be defective) approximately once every two months. What is the probability that there will be 3 failures in a two-month time period?
a. dbinom(3, 2, 0.5)
[1] 0.375
b. pbinom(3, 2, 0.5)
[1] 0.875
c. dpois(3, 1)
[1] 0.06131324
d. ppois(3, 1)
[1] 0.9810118