Most exhibition shows open in the morning and close in the late evening. A study of Saturday arrival times showed that the average arrival time was 3 hours and 48 minutes after the doors opened, and the standard deviation was estimated at about 53 minutes. Assume that the arrival times follow a normal distribution. IA use SA (a) At what time after the doors open will 94% of the people who are coming to the Saturday show have arrived? (Round your answer to the nearest number of minutes.) 310.415 J minutes after doors open (b) At what time after the doors open will only 15% of the people who are coming to the Saturday show have arrived? (Round your answer to the nearest number of minutes.) 236 X minutes after doors open