The distribution of the time until change (in days) of a Web site is approximated in the following table. Days until Changes Probability 1.5 0.10 3.0 0.20 4.5 0.35 5.0 0.20 7.0 0.15 Let the random variable X denote the days until change. Calculate the mean for X. Give exact answer. E(X) = days

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