The discrete random variable X has probability function

P(X = x) =

Find P(X = 2) and complete the table below.

x 0 1 2 3

P(X=x)3a 2a b

Given that mean = 1.6 find the value of a, b and P(0.5 < X < 3).

Jared had 3/7 of the minutes on a family phone plan remaining for the month. the plan is shared by 2 people. if divided equally what portion of the minutes remaining on the phone plan would be avalible for each person