1. Suppose the likelihood that any flight on Northwest Airlines arrives in 15 minutes of scheduled time is .90. We select four flights from yesterday for study.
a. What is the likelihood all four of selected flights arrived in 15 minutes of scheduled time?
b. What is the likelihood that none of selected flights arrived in 15 minutes of scheduled time?
c. What is the likelihood at least one of selected flights did not arrive in 15 minutes of scheduled time?