The following is a probability distribution of the number of defects on a given contact lens produced in one shift on a production line:

Number of Defects 0 1 2 3 4 Probability 0.50 0.20 0.15 0.10 0.05 Let A be the event that one defect occurred, and B be the event that 2, 3, or 4 defects occurred. Find:

(a) P(A) and P(B)

(b) P(A and B)

(c) P(A or B) LO.1