i need help with these questions please help me

Three tables listed below show random variables and their probabilities. However, only one ofthese is actually a probability distribution. a c x p(x) x 2(x) 5 0.1 5 0.1 10 0.1 10 0.1 15 0.5 15 0.5 20 0.5 20 0.7 3. Which is it? (Click to select) v b. Using the correct probability distribution, find the probability that x is: (Round the final answers to 1 decimal place.) 1. Exactly 5 = 2. No more than 15 = MW 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 1.1 2 2- Variance a