I'm currently just learning about Maximum likelihood estimators and I'm a bit stuck on how I should answer this question.
So far I know that for the function to hold, the observation 4 should be <= 2*theta. and that theta>=2 as a result right?
But then I'm not sure how to use it to find the estimator.
I set the Likelihood function as the following
I know I'm supposed to differentiate the log likelihood functions with respect to theta but I get -1/theta=0. Is there no mle estimator or am I missing something?