Section 8.1 Distributions of Random Variables

x is the standard deviation and if you square that value, (x)2, you will get the variance. Also, as mentioned in last class, ¯x is the mean or expected value. 1. The probability distribution of a random variable X is given. x 410 490 530 P(X = x) .2 .5 .3 Find the mean, standard deviation, and variance of X. (Round answers to two decimal places.) ................
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