A certain baseball player hits a home run in 8 of his at-bats. Consider his at-bats as independent events. How many home runs do we expect the baseball player to hit in 850 at-bats?
A) 8 B) 68 C) 62.56 D) 858
Q. 2Many firms use on-the-job training to teach their employees computer programming. Suppose you work in the personnel department of a firm that just finished training a group of its employees to program,
and you have been requested to review the performance of one of the trainees on the final test that was given to all trainees. The mean and standard deviation of the test scores are 83 and 3, respectively. Assuming nothing is known about the distribution, what percentage of test-takers scored above 89?
A) at most 25 B) approximately 2.5
C) at least 75 D) approximately 97.5
Q. 3A certain baseball player hits a home run in 4 of his at-bats. Consider his at-bats as independent events. Find the probability that this baseball player hits at most 16 home runs in 650 at-bats?
A) 0.0287 B) 0.96 C) 0.04 D) 0.9713
Q. 4A certain baseball player hits a home run in 4 of his at-bats. Consider his at-bats as independent events. Find the probability that this baseball player hits more than 16 home runs in 650 at-bats?
A) 0.0287 B) 0.04 C) 0.96 D) 0.9713
Q. 5Transportation officials tell us that 60 of drivers wear seat belts while driving. What is the probability that between 364 and 374 drivers in a sample of 650 drivers wear seat belts?
A) 0.0170 B) 0.0905 C) 0.1075 D) 0.8925
Q. 6Transportation officials tell us that 80 of drivers wear seat belts while driving. What is the probability of observing 518 or fewer drivers wearing seat belts in a sample of 700 drivers?
A) approximately 1 B) approximately 0 C) 0.8 D) 0.2
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