Kai is making a chessboard using pieces of wood that measure 1 square inch. When he finishes, the chessboard will have an area of 64 square inches.
How many pieces of wood should he put along each side?
64 pieces of wood
642 pieces of wood
8 pieces of wood
82 pieces of wood

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.