Suppose you have a very long highway which we will model as a straight line of infinite length starting at x=0 and stretching all the way to x=∞. One fire station it to be located along the road and a fire will break out at a random point along the road. The distance X of the fire from X=0 has an exponential distribution with mean equal to 4 miles.
We want to find the optimal place x=a to locate a fire station
on this road. To do this we wish to minimize the function
H(a)=E[(X−a)^2], a≥0.
Choose a to minimize this function.
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