Ava's morning routine is normally distributed and independent. She has been tracking her time from when she leaves to house to when returns all year. The mean time is 14 minutes and the standard...

Ava's morning routine is normally distributed and independent. She has been tracking her time from when she leaves to house to when returns all year. The mean time is 14 minutes and the standard deviation is 1.5 minutes. Suppose two mornings are randomly selected. What are the expected difference and standard deviation of the difference between the randomly selected morning times?