其它
\textbf{Ten percent of all trucks undergoing a certain inspection will fail the inspection. Assume that trucks are independently undergoing this inspection one at a time. The expected number of trucks inspected before a truck fails inspection is} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{This follows a geometric distribution.}  $$\mu = \frac{1}{p} = \frac{1}{0.10} = 10$$ 