Question: operation design just the final answer 3. Suppose that the amount of time a machine produces an item is normally distributed with mean 4 hours

operation design

just the final answer

3. Suppose that the amount of time a machine produces an item is normally distributed with mean 4 hours and standard deviation 1 hour. What is the probability that the amount of time for this machine to produce 4 items is greater than 18 hours? (a) 15.87% (b) 34.13% (c) 47.72% (d) 2.28% ( 19.15%

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