Twenty percent of american households
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.
The mean of X is
A. 2.
B. 4.8.
C. 23.04.
D. 28.80.
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Opinion polls find out that 20% of Americans adults claim that they don't get enough sleep. Assume you take the random sample of 200 American adults and count the number X in your sample that claim that they never have time to relax.
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.
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