math171 lab1 1-31-08

math171 lab1 1-31-08 - This graph is far more favored...

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Introduction exercise: 1. a) b) Every case had between 40 and 65 successes (times a coin landed heads). The most common number of successes was around 50 per case, with less numbers of cases with successes around 40 or 60. 2. a) One Bernoulli trial would be a guessed answer on a single question, with a 0.25 probability of success. There are seven trials in this binomial experiment. The random variable is whether or not a question is answered correctly.
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b) c) The graph shows the greatest number of cases having 1, 2, or 3 questions right.
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Unformatted text preview: This graph is far more favored toward the left of the graph than the coin-flipping exercise, which showed a generally even-favored graph. You would have a reasonable chance to get a respectable grade of 3 or 4, but you would be more likely to get a 1 or 2. d) In none of the 100 cases did the test-taker get more than 25 questions right. The greatest concentration of right answers was around 13 questions per test. Conceivably it was possible to guess all 50 questions correctly, but none of these cases showed such a result....
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math171 lab1 1-31-08 - This graph is far more favored...

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