Assume that when adults with smartphones are randomly selected, 49% use them in meetings or classes. if 9 adult smartphone users are randomly selected, find the probability that at least 4 of them use their smartphones in meetings or classes.

The mountain springs water company has two departments, purifying and bottling. the bottling department received 67,000 liters from the purifying department. during the period, the bottling department completed 65,000 liters, including 3,000 liters of work in process at the beginning of the period. the ending work in process was 5,000 liters. how many liters were started and completed during the period?