Question

Of all the registered automobiles in a city, 8% fail the emissions test. Eight automobiles are selected at random to undergo an emissions test. Round the answers to four decimal places. Part 1 of 4 (a) Find the probability that exactly four of them fail the test. The probability that exactly four of them fail the test is . Part 2 of 4 (b) Find the probability that fewer than four of them fail the test. The probability that fewer than four of them fail the test is . Part 3 of 4 (c) Find the probability that more than three of them fail the test. The probability that more than three of them fail the test is . Part 4 of 4 (d) Would it be unusual for more than one of them to fail the test? It be unusual for more than one of them to fail the test since the probability is .

Answer 1

It would not be usual because the probability is not less than 5% or 0.05

So we can say that the probability for more than oneof them to fail the test is usual.