Below is a distribution for number of visits to dentists in one year.

X	1	2	3	4	5
P(X=x)	0.25	0.42	0.20	0.06	0.07

Calculate the following probabilities:

a. P(X < 2) =

b. P(X 3) =

c. P(1< X 3) =

d. P(3 X < 5) =

e. P(3 < X < 5) =