3. Suppose that X is a discrete random variable with probability mass function (pmf) as summarized in the table below. -3 f(x) 0.35 0.25 0.4 Find the cumulative distribution function (cdf) F(r) of X. You may either write F(x) as a piecewise defined function or sketch a graph of F(x). Also, no work is required to be shown in this problem.

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