1. Table 2 gives the probability distribution of the random variable X. Compute the mean and the variance of the random variable.

2. An urn contains four red balls and four white balls. An experiment consists of selecting at random a sample of four balls and recording the number of red balls in the sample. Set up the probability distribution, and compute its mean and variance.

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Table 2 Pr(X = k) .2 1 .3 .1 .4 10