Carlos does his shopping at the same time each Friday. He estimates that the probability that he has to queue at the supermarket checkout is 5/6, and the probability that he has to queue at the post office is 1/4 . When he does his shopping next Friday, what is the probability that he will queue at: a. both places b. neither place?​

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.