I need sum 1 to talk 2, 15+ only idc if boy or girl, and what is 6+24838/3

Which expression is equivalent to sq-80

Ineed with math stuff it involves graphs

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.