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Q5 4 Points The inter-arrival time of market shocks is modeled by an exponential distribution with pdf f(x) = ze ", > > 0. Consider a random sample {X1, . .. , An} from this distribution.05.3 1 Point Compute the CramrRao lower bound for unbiased estimators of 9. Does the variance of the sample mean X\" attain the lower bound? Enter your answer here