Measurements for the length and width of rectangular plastic covers for CDs are rounded to the nearest mm. Let X denote the length and Y denote the width. Assume that the joint probability of X and Y is represented by the following table:                                               x = length, y = width   129 130 131 15 0.12 0.42 0.06 16 0.08 0.28 0.04 What is the probability distribution of X?

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