The Census Bureau reports that the 82% of Americans over the age of 25 are high school graduates. A survey of randomly chosen residents of a certain county included 1340 who were over the age of 25, and 1086 of them were high school graduates.
(a) Determine the mean and standard deviation for the number of high school graduates in groups of 1340 Americans over the age of 25.
Mean =
Standard deviation =
(b) Is that county result of 1086 unusually high, or low, or neither?