Times for a surgical procedure are normally distributed. there are

  

Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 28 minutes and a standard deviation of 2 minutes, while method B has a mean of 32 minutes and a standard deviation of 1.0 minutes.

  

(A)Which procedure is preferred if the procedure must be   completed within 30 minutes?

  

(B)Which procedure is preferred if the procedure must be     completed within 34.0 minutes?

  

(c)

Which procedure is preferred if the procedure must be       completed within 31 minutes?

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