Abicycle store installs about 400 tires per day. tires are installed monday through friday for 8 hours per day. the owner of the store estimates the number of properly installed tires per week using the process below. in the first hour of work on monday, 49 out of 50 tires were properly installed. so, there were about 8(49) = 392 properly installed tires on monday. considering 5 working days per week, 5(392) = 1,960 is the number of tires properly installed in one week. which best explains the validity of the results?