Question

Find the variance and the standard deviation of the sum obtained in tossing a pair of fair dice.

Answer 1

Question #65389, Math / Statistics and Probability

Find the variance and the standard deviation of the sum obtained in tossing a pair of fair dice.

Answer.

$$\begin{array}{l} \mu = \sum x p(x) = 7 \\ \sigma = \sqrt{\sum x^{2} p(x) - \mu^{2}} = \sqrt{\frac{35}{6}} \approx 2.4152. \end{array}$$

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