numerical and structural characteristics of discreate random variables X: math expectations,variance, standard deviation.construct the polygon of the distribution and cumulative distribution function

Task 1 Find numerical and structural characteristics of discrete random variables X: math expectation, variance, standard deviation. Construct the polygon of the distribution and cumulative distribution function. 25 0,14 0,12 0,18 0,14 0,12 0,09 Task 2 Cumulative random variable X is defined by density function H 0, if x N. , where N - the number of your name in the group register. Find the coefficient a, E(X), var(X), o(X) of the continuous variable X and the probability of hitting an interval (-0.5:1)