i badly need help with these questions, pls help me with solution and answer. i will give 5 stars for accurate and correct

. Let X1, X2, ..., Xn be a random sample from Poi (2). Find CRLB for . T (1) = 2 . T (2) = e-1 . Let X1, X2, ..., Xn be a random sample from Ber(p). Define T = X, and let S = _X, be a sufficient statistic. Find the Rao-Blackwellized estimator T' for p. . Let X1, X2, ..., Xn be a random sample from Exp()), where a is unknown. Define S = > X; as a complete sufficient statistic. Use the Lehmann-Scheffe Theorem to determine the UMVUE for 2