(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The distance between major cracks in the highway follows an exponential distribution with a mean of 5 miles. What is the probability that there are two major cracks in a 10 mile stretch of the highway?

2. Relevant equations

exponential dist: f(x) = Le(-Lx) where L = lambda (sorry i dont know latex)

E(X) = 1/L V(X) = 1/(L)^2

3. The attempt at a solution

well i'm abit stumped because the probability density function for the exponential dist tells us the time to an event etc.. not the number of events. So i really don't have much of an attempt :(

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# Homework Help: Exponential distribution Q

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