Question

Use the probability distribution graph to answer the question.

What is P(X<3)?

Answer 1

P(x<3) is the area under the triangle to the left of 3
you can most easily find it as
1 - area of small triangle to the right of 3
(height 0.25 and width 1 makes that area 0.125 and 1- 0.125 = 0.875)

(notice the entire area of the triangle is 1 -- as it should be)