1 Explain when it is appropriate to use a quadratic model for a set of data.
O A quadratic model is appropriate when the first differences are constant.
O A quadratic model is appropriate when the data points lie on a line.
O A quadratic model is appropriate when the second differences are constant.
O A quadratic model is appropriate when the second differences are 0.

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.