Number of households selected
Twenty percent of American households own three or more cars. A random of 144 American households is chosen. Let X be the number of households selected that own three or more cars.
The standard deviation of X is
A. 2.
B. 4.8.
C. 23.04.
D. 28.8.
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Twenty percent of American households own three or more cars. A random of 144 American households is chosen. Let X be the number of households chosen that own three or more cars.
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