Susan bikes 3 miles round-trip from home to school, Monday through Friday. On Saturday and Sunday she does not ride her bike, but skateboards around her neighborhood. How many miles total does she bike to and from school each week?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.