If sample X1 + 1, X2 + 1 For samples X1 + 2, X2 + 2 The following conclusion is correct () A. The mean is 10 and the variance is 2B. The mean is 11 and the variance is 3C. The mean is 11 and the variance is 2D. The mean is 12 and the variance is 4

If sample X1 + 1, X2 + 1 For samples X1 + 2, X2 + 2 The following conclusion is correct () A. The mean is 10 and the variance is 2B. The mean is 11 and the variance is 3C. The mean is 11 and the variance is 2D. The mean is 12 and the variance is 4

From the title, X1 + 1 + x2 + 1 + X3 + 1 + +xn+1=10n，∴x1+x2+… +xn=10n-n=9nS12=1n[（x1+1-10）2+（x2+1-10）2+… +（xn+1-10）2]=1n[（x12+x22+x32+… +xn2）-18（x1+x2+x3+… +xn）+81n]=2，∴（x12+x22+x32+… +Xn2) = 83n

Elden Ring Premiere

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