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MMLU / Company I manufactures demolition fuses that burn an average of 50 minutes with…

Problem

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question

Company I manufactures demolition fuses that burn an average of 50 minutes with a standard deviation of 10 minutes, while company II advertises fuses that burn an average of 55 minutes with a standard deviation of 5 minutes. Which company's fuse is more likely to last at least 1 hour? Assume normal distributions of fuse times.

choices

  1. Company I's, because of its greater standard deviation
  2. Company II's, because of its greater mean
  3. For both companies, the probability that a fuse will last at least 1 hour is 0.159
  4. For both companies, the probability that a fuse will last at least 1 hour is 0.841

subject

high_school_statistics

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