SOLUTION: If you randomly observe 200 cars, and let X denote the number with properly cleaned windows, what is the mean of X? Only 40% of drivers properly clean their car windows after a

Question 1126238: If you randomly observe 200 cars, and let X denote the number with properly cleaned windows, what is the mean of X?
Only 40% of drivers properly clean their car windows after a snowstorm.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
We know that the mean of the sampling distribution of the proportion (μ(p)) is equal to the probability of cars with properly cleaned windows in the population (P).
:
We are given that 40% of drivers properly clean their car windows.
:
Therefore, 200 cars (sample size) * 0.40 = 80 cars properly cleaned is the mean of X
:

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