Question: The average cleanup time for a crew of a mediumsize firm is 84.0 hours and the standard deviation is 6.8 hours. Assume the empirical rule

The average cleanup time for a crew of a mediumsize 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 cleanup crew 97.6 hours or more to clean the plant?
b. Within what interval will the total cleanup time fall 95% of the time?

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