question below

A travelling fun fair has five different rides. The table below shows the probability distribution of the number of rides each visitor buys. (X = number of rides). X P(X=x) 0 0.15 0.10 2 0.20 3 0.25 4 0.20 5 0.10 a) What is the probability that a random visitor buys at least one ride? b) What is the probability that a random visitor buys two or three rides? c) Calculate expected value E(X) and the variance Var(X) and give an interpretation of E(X) d) Each ride costs 35 kr. What is the expected income from a group consisting of 40 persons