Observation refers to the a. estimated continuous outcome variable. b. set of recorded values of variables associated with a single entity. c. goal of predicting a categorical outcome based on a set of variables. d. mean of all variable values associated with one particular entity.

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.