A manager at a fast food restaurant calculated a confidence interval for the mean amount of time (in minutes) it takes for food orders to go out. Her result was (5.4, 7.2) with 95% confidence. Determine the proper notation and the value of both the point estimate and margin of error for the customer's mean waiting time. X = 6.3, E = 0.9 O H = 6.3, E = 0.9 O X = 6.3, E = 1.8 O M = 6.3, E = 1.8 O X= 0.9, 8 = 6.3