What percentage of time does lathe produce more components


In a job shop there are five lathes which produce automotive components. The number of components produced per hour is normally distributed with a mean of 25 and a standard deviation of 4.

a) What percentage of the time does a lathe produce more than 27 components per hour?
b) What percentage of the time is the average rate of output of the five lathes more than 27 components per hour?

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Basic Statistics: What percentage of time does lathe produce more components
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