SOLUTION: If P(A) = 0.4, P(B) = 0.7, and A and B are independent, find P(A or B) Please help

Algebra ->  Probability-and-statistics -> SOLUTION: If P(A) = 0.4, P(B) = 0.7, and A and B are independent, find P(A or B) Please help      Log On


   

Question 949058: If P(A) = 0.4, P(B) = 0.7, and A and B are independent, find P(A or B) Please help
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
P(A or B) = P(A) + P(B) - P(A and B)

P(A or B) = P(A) + P(B) - P(A)*P(B) ... this is valid since A and B are independent

I'll let you finish up.