Suppose W is a random variable representing the number of traffic lights you may have to stop at while going to work, with the range {1,2,3,4,5}R _W={1,2,3,4,5}, and the corresponding probabilities are 0.1, 0.25, c, 0.2, respectively.
What is the value of c?
A)0.2
B)0.35
C)0.45
D)0.55
