Time for a surgical procedure are normally distributed. There are two methods, method a has a mean of 32 minutes at a standard deviation of two minutes, while method B has a mean of 36 minutes and a standard deviation of 1.0 minutes A) which procedure is prefer if the procedure must be completed within 31 minutes A Method a B method b C Either method B) which procedure is preferred if the procedure must be completed within 39 minutes A Method a B method b C Either method C) which procedure is preferred if the procedure must be completed within 38 minutes A Method a B method b C Either method