Thomas wrote four checks last month, and these were the only transactions for his checking account. according to his check register, his balance is $444.12, but the bank statement he just received says his balance is $526.32. if the four checks were for $73.75, $87.65, $82.75, and $82.20, the check for which amount has not yet cleared?

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.