A drive-through fast-food chain obtained the following pick-up times (number of minutes between the time an order is placed and the time the order is picked up at the drive-through window). A random sample of 32 orders along with the corresponding duration is given in the accompanying table. a. What is the approximate mean pick-up time? b. What is the approximate variance and standard deviation? a. The approximate mean pick-up time is (Type an integer or decimal rounded to two decimal places as needed.)