1) Let X1, X2, Xn be i.i.d. samples from a distribution X with mean and standard deviation o. Let 2.... ´X₁ + X₂ + ... + Xn û = 7 be an estimator of μ. Find the risk of μ. n 70² n 70² n n 490² n +36μ² 490² + 6μ2 O No Yes + 6μ2 2) Is the estimator unbiased? +36µ²