Quiz 1-2_MATH302.docx - Quiz 2_MATH302 Question 1 of 20 1.0 1.0 Points The staff at a small company includes 4 secretaries 20 technicians 4 engineers 2

Quiz 1-2_MATH302.docx - Quiz 2_MATH302 Question 1 of 20 1.0...

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Quiz 2_MATH302 Question 1 of 20 1.0/ 1.0 Points The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected at random, what is the probability that he or she is a factory worker? A. 1/4 B. 1/8 C. 5/8 D. 2/5 Answer Key: C Question 2 of 20 1.0/ 1.0 Points If two events are mutually exclusive, what is the probability that one or the other occurs? Answer Key: C Question 3 of 20 1.0/ 1.0 Points If one tosses a coin enough times, the proportion of "heads" will approach 0.5. This is an example of: Answer Key: A Question 4 of 20 1.0/ 1.0 Points
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If P(A) = P(A|B), then events A and B are said to be A. independent B. complementary C. mutually exclusive D. exhaustive Answer Key: A Question 5 of 20 1.0/ 1.0 Points The number of ways to choose two representatives from a committee of 13 people is A. 55 B. 78 C. 13! D. 156 Answer Key: B Question 6 of 20 1.0/ 1.0 Points The binomial distribution can occur in which of the following situations? I. whenever we are interested in the number of events that occur over a given interval of time II. whenever we sample from a population with only two types of members III. whenever we perform a sequence of identical experiments, each of which has only two possible outcomes Answer Key: C Question 7 of 20 1.0/ 1.0 Points
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A drug is reported to benefit 40% of the patients who take it. If 6 patients take the drug, what is the probability that 4 or more patients will benefit? A. 0.179B. 0.862 C. 0.667 D. 0.138 Answer Key: A Question 8 of 20 1.0/ 1.0 Points Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30. What is the probability that between 25 and 30 batteries (inclusive) will last at least 8 hours? Answer Key: B Question 9 of 20 1.0/ 1.0 Points Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30. What is the probability that greater than 30 batteries will last at least 8 hours? Answer Key: C Question 10 of 20 1.0/ 1.0 Points
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The probability distribution associated with the number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below. X P(x) 0 0.15 1 0.20 2 0.30 3 0.10 4 0.20 5 0.05 A. 1.46 B. 2.25 C. 1.89 D. 1.18 Answer Key: A Question 11 of 20 1.0/ 1.0 Points
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