Question: The average clean-up time for a crew of a medium-size firm is 84.0 hours and the standard deviation is 6.8 hours. Assume the empirical rule

The average clean-up time for a crew of a medium-size firm is 84.0 hours and the standard deviation is 6.8 hours. Assume the empirical rule is appropriate.

a. What proportion of the time will it take the clean-up crew 97.6 hours or more to clean the plant?

b. Within what interval will the total clean-up time fall 95% of the time?

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