Asked by corinna

emma draws this diagram. She says it shows part of a regular polygon. Explain how you can tell that Emma must have made a mistake (it is a 158 degree angle)
Answered by drwls
For a regular polygon, external angles at each corner must be evenly divisible into 360. 158 degrees does not satisfy that requirement As for internal angles,A, they must satisfy
A = 180 - 360/N, where N is the number of sides. 158 degrees does not satisdfy that reurment either
Answered by Anonymous
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 80 people.
(a) How many would you expect to be between 157 and 173 cm tall?




(b) How many would you expect to be taller than 160 cm?
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