Suppose the waiting time for the next earthquake in a certain region is exponentially distributed with parameter lambda=0.125. Find the average time until the next earthquake in that region.

Question

Suppose the waiting time for the next earthquake in a certain region is exponentially distributed with parameter lambda=0.125.  Find the average time until the next earthquake in that region.

amistre64 · Answer

isnt this a poisson distribution?  if so, what is the function of poisson

anonymous · Answer

$$P(X=x) = \frac{ (\lambda t)^xe^(-\lambda t) }{ x}$$
I don't understand what it is asking, I thought lambda was the mean?

amistre64 · Answer

lambda should be the mean and  ... what is it, variance or standard deviation.