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 0.05 3.0 0.25 4.5 0.35 5.0 0.20 7.0 0.15 Let the random variable X denote the days until change. Detemine the cumulative distribution function for X. x < 1.5 1.5

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