When coin a is flipped, it lands on heads with probability 0.4; when coin b is flipped, it lands on heads with probability 0.7.
one of these coins is randomly chosen and flipped 10 times. given that the first of these 101 flips lands on heads, what is the conditional probability that exactly 7 of the 10 flips land on heads?
The answer would be B. Look at the graph - on top, to the left goes toward -infinity, while to the right it does the opposite. On the bottom, or the y, to the left and right it increases indefinitely. Plug this together, and you have your answer. I hope this helped, and have a nice day!