A sample of 35 movies made in 2010 had a sample mean length of 121.6 minutes and a sample standard deviation of 20.4 minutes. Find a 95% confidence interval for the population mean . What is the UPPER BOUND? ______________________________ Note: Enter XXX.X AT LEAST ONE DIGIT BEFORE THE DECIMAL, ONE AFTER and round up. Thus, 134.78 is entered as 134.8, 35.292 is entered as 35.3, .2750 is entered as 0.3, -.5647 is entered as -0.6