The random variable X, representing the number of errors per 100 lines of software code, has the following probability distribution. 3 4 5 6 f(x) 0.3 0.25 0.01 0.04 0.4 Use the following theorem to determine the variance of the random variable X. The variance of a random variable X is o? = E (x?) - u?. The variance is (Round to two decimal places as needed.)

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

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