Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 21 minutes and a standard deviation of 5 minutes, while method B has a mean of 25 minutes and a standard deviation of 2.5 minutes. (a) Which procedure is preferred if the procedure must be completed within 23 minutes?

• Method A
• Method B
• Either Method

(b) Which procedure is preferred if the procedure must be completed within 32.0 minutes?

• Method A
• Method B
• Either Method

(c) Which procedure is preferred if the procedure must be completed within 29 minutes?

• Method A
• Method B
• Either Method