Ommmg please help me with this question I don’t understand it at all, I only have 2 minutes left for this test please help me I mean like I’m confused between surface area and area but like I’m not completely sure so, somebody help me out and also, explain why.

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.