Question 3 (6 pts): The following table represents gas well completions during 1986 in North and South America. (Source: American Gas Association, 1987 Gas Facts, p. 50.) Dry (D) Not dry (D') TOTALS North America (N) 14,131 31,575 45,706 South America (N') 404 2,563 TOTALS 14,535 34,138 2,967 48,643 a) P(D)= P(N) = b) P(D and N)= P(D' and N)= P(D and N') P(D' and N')= c) P(D or N)= P(D' or N)= P(D or N')= P(D' or N')= (Note: The sign means complement of an event.) Useful Formulas: Rule 1: P(A or B) = P(A) + P(B) - P(A and B) Rule 2: P(A or B) = P(A and B)' P(A and B) Rule 3: P(A|B)= P(B) Rule 4: P(A|B)= P(A)XP(BA) [DADRADARBA