Unformatted text preview: chemical kills some of the trees. Suppose that one such chemical would kill 20% of sycamore trees. The power company tests the chemical on 250 sycamores. Consider these an SRS from the population of all sycamore trees. 4. What are the mean and standard deviation of the proportion of trees that are killed? 5. What is the probability that at least 60 trees (24% of the sample) are killed? (Remember to check that you can use the normal approximation.) Chapter 9...
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 Spring '09
 Mr.Brown
 Statistics, Normal Distribution, Standard Deviation

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