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Ryan, Engineer

Category: Calculus and Above

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Experience: B.S. in Civil Engineering

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(TCO B) According to a survey by the Opinion Research Corporation,

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(TCO B) According to a survey by the Opinion Research Corporation, 60% of all clerical workers in the United States “liked their jobs very much.” A random sample of 15 clerical workers is selected. Find the probability that

a. exactly nine of these clerical workers “liked their jobs very much.” b. at least seven of these clerical workers “liked their jobs very much.” c. fewer than five of these clerical workers “liked their jobs very much.” (Points : 18)

Do you know if you are expected to determine an exact value using the binomial probability calculation, or if you are supposed to use the normal approximation to the binomial distribution?