Two random variables X and Y are distributed with an unknown joint PDF. From simultaneous measurements, the data obtained are shown in the picture below. 1.5 1 0.5 -0.5 -1 -1.5 2 2.5 -2 -1.5 -1 0.5 0.5 1. 1.5 2.5 What can you infer about the value of the correlation coefficient among the two random variables? Justify your answer.

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