Question

Directions: Calculate each conditional probability. Show all work and write the answer as a reduced fraction, unless otherwise specified.1. What is the formula for finding the conditional probability of event  occurring, given that event  has already occurred?2. If the first card selected is a red card, what is the probability of selecting a black card on the second draw from a standard deck of cards? Write the probability as a percentage.

Answer 1

1. the conditional probability formula for an event A given that a event B has already ocurred is:

`P(A\rbrack B)=\frac{P(\text{AnB)}}{P(B)}`