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10. (6 points) In the Denver 45% of houses have a high radon level

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10. (6 points) In the Denver 45% of houses have a high radon level.
If 20 houses are randomly selected, a. what is the probability that 6 will have a high radon level?
b. What is the probability that at most 6 will have a high radon level?
c. If 6 of the 20 houses were found to have a high radon level, would this be unusual? Why or why not?

 
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