State clearly, thanks

4.(25pts) Let independent random variables X1, ..., Xn have the common distribu- tion 0 if x a (a) Find the MLE of a and B (b) Use the following data (simulated from distribution above) to find the MLE for a and B. 25.0 20.9 23.8 23.0 23.5 23.8 22.0 22.8 24.0 23.9