hello can you help me answer these 4 questions please

a. The following table contains the probability distribution of the number of traffic light failures per week in a city. Assume that no more than four traffic light failures occur per week. Number of failures Probability per day (x) P(x) x P(x) x2 P(x) 0.10 1 0.25 2 0.40 3 Y= A 0.10 i. Calculate the value of Y in the table. [1 ii. What is the probability that the number of traffic light failures per week is more than 2? iii. What is the expected number of traffic light failures per week in this city? iv. Compute the standard deviation for the above probability distribution