15(a) Let X1, X2, Xg X be the independent normal random variables with mean 2 and variance 3. It is known that X also follows a normal distribution. Find the mean of X. Based on 15(a), find the probability P(X> 1.5) Based on 15(a), find the variance of X. (x <3) Based on 15(a), find the probability PX

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