1. Jen will call Cathy on Saturday with a 60% probability. She will call Cathy on Sunday with an80% probability. The probability that she will call on neither of the two days is 10%. What is the probability that she will call on Sunday if she calls on Saturday? 40 Conditional Probability and Independence
2. On a table there is a double-headed coin and there is a fair coin. One of them was randomly chosen and tossed, and the outcome was a head. What is the probability that the lower side of this coin is a tail?
3. Suppose P.A/ D P.B/D :9. Give a useful lower bound on P.BjA/.
4. Two distinct cards are drawn one at a time from a deck of 52 cards. The first card chosen is the ace of spades. What is the probability that the second card is neither an ace nor a spade?