0 votes 0 votes If the probability for A to fail an examination is 0.2 and that for B is 0.3, then probability that either A of B fail is (a) 0.5 (b) 0.06 (c) 0.44 (d) 0.38 Probability engineering-mathematics isro-mech probability + – sh!va asked Mar 8, 2017 sh!va 878 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
3 votes 3 votes P(A)=.2 P(B)=.3 $P(A\cap B)=P(A)*P(B)=.2*.3=.06$ $P(A\cup B)=P(A)+P(B)-P(A\cap B)$ $=.2+.3-.06$ $=.44$ 2018 answered Mar 8, 2017 edited Mar 8, 2017 by 2018 2018 comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes Option C is Correct. P(A¯) = 0.2 P(A) = 1−0.2 = 0.80 P(B¯)=0.3 P(B) = 1−0.3 = 0.7 P(A¯∪B¯)= $P(\overline{A\cap B})$ =1−P(A∩B) = 1−P(A)P(B) =1−(0.8)(0.7) =0.44 Shubham Sharma 2 answered Mar 8, 2017 Shubham Sharma 2 comment Share Follow See all 0 reply Please log in or register to add a comment.