There were exactly 28 students in Ms. Pine's class. She gave each student a piece of paper. Each student put his or her name on the piece
of paper.

1/4 of the students put their names on the right side of the paper.
3/7 of the students put their names on the left side of the paper.
The remaining students put their names on the center of the paper.

What is the total number of students in Ms. Pine's class who put their
names on the center of the paper

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.