Quiz%202-%20February%2019-Solution

Quiz%202-%20February%2019-Solution - QUIZ 1- BIT 2405-...

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QUIZ 1- BIT 2405- February 19, 2009 N a m e 1 : I D 1 : N a m e 2 : I D 2 : N a m e 3 : I D 3 : 1. Events that have no sample points in common are 1. independent events 2. posterior events 3. mutually exclusive events 4. complements I. The following table lists the type and number of customer complaints for a satellite TV company for a month. Answer the questions following it. Carry arithmetic to at least 3 decimal places where applicable and round answers to two decimal places where applicable. Complaint Number No signal 175 Not all channels working 140 Bad reception 85 Billing errors 55 Customer service 30 Other 15 Total 500 Let A= the event that a randomly selected customer complaint involves bad reception or billing errors Let B=the event that a randomly selected customer complaint involves no signal, not all channels working or bad reception. 2. What is the probability that a randomly selected customer complaint involves no signal, not all channels working, or bad reception? 1. 0.80 2. 0.28 3. bad reception 4. None of the above 3. What is (A B)? 1. 0.80 2. 0.28 3. bad reception 4. None of the above 4. Are A and B mutually exclusive? 1. No 2. Yes 3. Can't determine 5. What is P (A B)? 1. 0.80 2. 0.28 3. bad reception 4. None of the above
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6. Given that a randomly selected customer complaint involves bad reception or billing errors, what is the probability that a randomly selected customer complaint involves no signal, not all channels working or bad reception? 1. 0.61
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This note was uploaded on 10/26/2009 for the course BIT 2405 taught by Professor Plkitchin during the Spring '08 term at Virginia Tech.

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Quiz%202-%20February%2019-Solution - QUIZ 1- BIT 2405-...

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