The time taken by operator A to finish a task has a normal distribution with a mean 220 minutes and a standard deviation 11 minutes The time taken by operator B to finish a task has a normal distribution with a mean 185 minutes and a standard deviation 9 minutes, independent of operator A Operator A began working at 9 A M The probability that operator A finishes before operator B is 0 90 What time did operator B start working

Question: The time taken by operator A to finish a task has a normal distribution with a mean 220 minutes and a standard deviation 11 minutes.

The time taken by operator A to finish a task has a normal with a mean 220 minutes and a standard deviation 11 minutes. The time taken by operator B to finish a task has a normal with a mean 185 minutes and a standard deviation 9 minutes, independent of operator A. Operator A began working at 9 A.M. The probability that operator A finishes before operator B is 0.90. What time did operator B start working?

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