27.1 QUESTION 27 (JUNE 2017)
Given g(x) = ax3 + bx+c, a = 0, which has the following properties.
f'(x) > 0 if x <-3 or x > 3
f'(x) < 0 if -3 f'(-3) = f'(3) = 0
f(0) > 0
Use the above information to draw a sketch of g.
(4)

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.