Can you explain how to solve such type of statistics questions?

It would be great help if you can explain variation of such questions as well.

Let X1, . .., X, (n > 2) be a random sample from the distribution of the random variable X with the following probability density function: fx (x) = 10 elsewhere. where > > 0 is an unknown parameter. The maximum likelihood estimator of Ais Select one: Ell Xi O Eil X, O Let X1, . ..; Xn(n > 2) be a random sample from the distribution of the random variable X with an exponential distribution with \\underline(mean) 3 > 0: Define the following estimators for B: B1 := 1EXi, B2 := EL Xi, and B3 := #X1+ #X2 Which of these estimators are unbiased? Select one: Only 32 O All of them O B, and 3 3 O None of them Let X1, . ..; Xn (n > 2) be a random sample from the distribution of the random variable X with a Poisson distribution with rate A > 0: Define the following estimators for A: A := 1EL X?, 12 := LER, X;, and A3 := 1X1+ 2X2 Which of these estimators are unbiased? Select one: only 12 O All of them O 2 and 13 None of them