A discrete random variable X takes on one of ten discrete values X = 0, 1, 2, . . . . , 10
has the following density function: P(X = 1) = 0.1, P(X = 3) = 0.2, P(X = 5) =
0.5, P(X = 10) = 0.2. All other discrete values of X occur with probability 0.
What is the value of the cumulative density function for X at X = 4?