For the exponential distribution f(x)=λe−λxf(x) = \lambda e^{-\lambda x}f(x)=λe−λx, what is the median?
1λ\frac{1}{\lambda}λ1
ln2λ\frac{\ln 2}{\lambda}λln2
ln2\ln 2ln2
λln2\lambda \ln 2λln2