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The three tables listed below show random variables and their probabilities. However, only one of these is actually a probability 28 distribution. A B X P(X) X P(X) X P( X ) 5 0. 4 5 0.4 5 7 10 0. 1 10 0.1 10 0 . 1 points 15 0.2 15 0. 2 15 20 0 .5 20 0.3 20 01:20:44 a. Which is it? (Click to select) v Files b. Using the correct probability distribution, find the probability that x is: (Round the final answers to 1 decimal place.) 1. Exactly 15 2. No more than 15 3. More than 15 c. Compute the mean, variance, and standard deviation of this distribution. (Round the final answers to 2 decimal places.) 1. Mean H 2. Variance of 3. Standard deviation o