A parade departs from City Hall and finishes at a park. On a map, the parade route is 8 centimeters long. If the scale of the map is 2 centimeters : 1 kilometer, then what is the actual distance between City Hall and the park?

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

Through non-collinear points there is exactly one plane.

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.