Suppose that in a certain metropolitan area 18% of all automobiles are equipped with an electric engine. Let denote the number among of 9 randomly selected automobiles that are equipped with an electric engine. Calculate
. Let the random variable
denote the number of passing automobiles that are equipped with an electric engine until you find automobile with another type of engine. Calculate
.
A) ,
B) ,
C) ,
D) ,
E) ,
Correct Answer:
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