20) Let 4 and B be events with P(4) = 0.2, P(B) = 0.5, and P(4 and B) = 0.08. Are 4 and B independent? A) Yes B) No ID: BESB8e 4.3.1-2+ 21) Let 4, B and C be independent events with P(4) =0.7, P(B) = 0.5, and P(C)=0.2. Find P(4 and B and C). ID: BESB8e 4.3.2-2+ 22) On an eight-question true-false quiz, a student guesses each answer. What is the probability that the student gets at least one of the answers correct? 255 1 A) B)E c)~ D) - 256 )3 )3 ID: BESB8e 4.3.4-5+ 23) Urn 1 contains 3 red balls and 2 black balls. Urn 2 contains 6 red balls and 6 black balls. Urn 3 contains 4 red balls and 3 black balls. If an urn is selected at random and a ball is drawn, find the probability it will be red. 39 13 1 13 A7 T260 G P23 ID: BESB8e 4.3.6-2