Once again, I extend the tabular approach used in the previous video (where we found the expected value), but in this case it is used to find the variance of x. The standard deviation of x is simply the square root of the variance (just like in Chapter 4).
Remember to make use of the order of operations:
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Let X represent the number of times a student visits a bookstore in a one month period. Assume that the probability distribution of X is as follows:
Which of the following is the correct standard deviation of this distribution?