22. A certain type of battery operated alarm clock only works 80% of the time. Bob buys two such clocks. What is the probability on any given morning that both clocks fail? Round your answer to three decimal places as necessary.

24. A certain type of battery operated alarm clock only works 80% of the time. Bob buys two such clocks. What is the probability on any given morning that at least one of these clocks works? Round your answer to three decimal places as necessary.

26. A certain type of battery operated alarm clock only works 95% of the time. Bob buys two such clocks. What is the probability on any given morning that at least one of these clocks works? Round your answer to four decimal places as necessary.

28. A certain type of battery operated alarm clock works correctly 98% of the time. Bob buys two such clocks. What is the probability on any given morning that both clocks fail? Round your answer to four decimal places as necessary.

29. A certain type of battery operated alarm clock works correctly 98% of the time. Bob buys two such clocks. What is the probability on any given morning that at least one of these clocks works? Round your answer to four decimal places as necessary.

30. A certain type of battery operated alarm clock works correctly 90% of the time. Bob buys three such clocks. What is the probability on any given morning that all three clocks fail? Round your answer to four decimal places as necessary.

31. A certain type of battery operated alarm clock works correctly 90% of the time. Bob buys three such clocks. What is the probability on any given morning that at least one clock works correctly? Round your answer to four decimal places as necessary.