Derek reads at a rate of 25 words per minute. if he reads constantly until he is finished, how long would it take him to read a 225 word article?
a) 93.75 hours
b) 10 hours
c) 5 hours
d) 9 minutes

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.