I am really confused on how to answer this problem

Of all of the registered automobiles in a city. 7% fail the emissions test. Twenty automobiles are selected at random to undergo an emissions test. Answer the following questions. Round the answers to 4 decimal places, if necessary. a) Find the probability that none of them fail the test. b) Find the probability that fewer than four of them fail the test. c) Find the probability that more than six of them fail the test. (do NOT use scientific notation) d) Find the probability that at most 2 of them fail the test. el Find the probability that at least 5 of them fail the test