In 2005, 74% of all airline flights were on-time. If we choose a simple random sample of 2000 flights, find the probability that (be as accurate as the proper process allows)
(a) at least 77% of the sample's flights were on time:
(b) at most 1420 of the sample's flights were on time:
(c) the sample proportion of on-time flights (p-hat) differs from the truth by more than thee percent (0.03):