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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Fifteen people were asked to indicate their preference for domestic versus imported cars. The following data showed their preferences.
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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.
Before that, the point near top of towe was 51.6,m from the point at base, and top point was directly above the point on ground 4.93, from base point. How much point on ground moved toward base point?
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