On testing a given sample, it was noted that on average, four parts failed every 60 minutes (assumed to be a constant rate).
1. What is the probability that no part fails in five minutes?
a. 0.592 b. 0.717 c. 0.882 d. 0.284
2. What is the probability that no part fails in five minutes?
a. 18 mins b. 16 mins c. 21 mins d. 9 mins