Let X1, X2,... be a sequence of random variables with finite mean u and non-zero variance o?. Let Sn X;. Which random variable has meanequal to 0 and variance equal to 1? Select one: O a. Zn Sn-nu Vno O b. Zn Vno O c. Zn Vño O d. Zn Vno

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A: n1=25x1=410s12=95n2=16x2=390s22=300

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A: It is an important part of statistics. It is widely used.