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An Exam Story

An Exam Story. Tommy reads the first problem on the exam.

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An Exam Story

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  1. An Exam Story

  2. Tommy reads the first problem on the exam • #1 Power companies trim trees growing near their lines to avoid power failures to falling limbs in storms. Applying a chemical to slow the growth of the trees is cheaper than trimming, but the chemical kills some of the trees. Suppose one such chemical would kill 20% of sycamore trees. The power company tests 250 sycamore sycamores. What is the probability that at least 60 trees are killed?

  3. Tommy calculates the important pieces of data necessary to solve the problem

  4. Tommy calculates the appropriate z-score and finds his answer

  5. Tommy feels good about his answer and continues on confidently throughout the test. He scores an A on the exam and goes on to great things.

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