About 3.2×10^8 people live in the United States. About 3.9×10^7 people live in Canada. And about 1.1×10^8 people who live in Mexico. About how many people live in all three countries altogether?

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.