Of the bolts manufactured for a certain application, 90% meet the length specification and can be used immediately, 6% are too long and can be used after being cut, and 4% are too short and must be scrapped.
a. What is the probability that a randomly selected bolt can be used?
b. What is the probability that fewer than 9 out of 10 bolts can be used?
c. What is the probability that exactly 9 out of 10 bolts can be used immediately?