The probability distribution for the random variable,x, is x: 2, 2.5,3.0,3.5,4.0,4.5 and P(x):0.07,0.36,0.21,0.19,0.10,0.07 Calculate P(x <= 3.9) a. 0.19 b. 0.57 C. 0.83 r d. 0.47

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