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Unformatted text preview: STAT 3502 Sample Midterm 1. A certain type of circuit board contains 200 diodes that function independently of each other. Each diode has probability 0.01 of failing. a. What is the approximate probability that exactly two diodes will fail? b. What is the approximate probability that more than 3 will fail? c. What is the mean and the standard deviation of the number of diodes that will fail? d. A board will work if none of its diodes fail. What is the approximately probability that a randomly selected board will work? e. Five boards are shipped to a customer. What is the probability that fewer than 2 of them will work? 2. Consider a roulette wheel consisting of 38 numbers, 1 through 38. If Mr. Smith always bets that the outcome will be one of the numbers 1 through 12, what is the probability that his first win occur on his 4th bet? 3. A piece of electronic equipment contains 8 computer chips, 3 of which are defective. If 5 computer chips are randomly selected, what is the probability that 2 of them will be defective? What is the average number of defective among the 5 chips selected? 4. An electronics shop receives a box of 100 electronic devices of which 10 devices have type A defects, 8 devices have type B defects, and 3 devices have both type A and type B defects. If a device is picked at random from the box, (so that each one of thetype B defects....
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This note was uploaded on 09/27/2010 for the course STAT 104157 taught by Professor Jhonbran during the Spring '09 term at California Coast University.
- Spring '09