Asquare of area 36 cm’ is cut to make two rectangles, a and b.
a
| b
area = 36 cm
the ratio of area a to area b is 2: 1
work out the dimensions of rectangles a and b.
rectangle a
rectangle b
length: cm length:
width:
cm
width:

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.