A surgeon would like to know how long it takes, on average, to complete a coronary artery bypass surgery. She samples 21 surgeries and logs the time it takes to complete each one, in hours: 6.9, 7.2, 6.3, 7, 5.6, 6.3, 5.6, 7.3, 4.9, 6, 7.4, 5.5, 4.9, 6.9, 6.2, 4.2, 6.4, 5.2, 6.4, 6.9, 5.5 Construct a 91% confidence interval for the average time it takes to complete a coronary artery bypass surgery. I = S = N/ R = to = Margine of Error: E = We are 91% confident that the mean amount of time it takes to complete a coronary bypass sugery is between hours and hours. Question Help: D Post to forum