Find x, find y, find z​

You can find the constant of proportionality by finding the ratio of

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

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.