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The clean-up crew of medium-sized firm has an average clean-up time of 72.0 total hours with variance of 64 hours squared. The clean-up times are bell-shaped.

(a) What proportion of time will it take the clean-up crew 56 or more hours for cleaning the plant?

(b) Ninety-five percent of the time total clean-up time will fall in what interval about the mean?

State the lower and upper limits of interval.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M916956

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