Probability Math

A farm has 5 brown cows and 10 white cows. A fence is open and two cows escape. What is the probability that it will be a brown cow, then a white cow?

• 1/9

• 2/9

• 5/21

• 10/21

In a cup are the numbers 1 - 20. Find the theoretical probability of 
picking an even number. 

• 10/20

• 1/2

• 1/20

• 20/20

A basket contains four apples and six peaches. You randomly select one piece of fruit and eat it. Then you randomly select another piece of fruit. What is the probability that both pieces of fruit are apples.

• 2/15

• 3/17

• 1/19

• 6/21

Which formula do you use when two events are NOT mutually exclusive?

• P(A or B) = P(A) + P(B)

• P(A or B) = P(A) + P(B) - P(both)

• P(A and B) = P(A) * P(B)

• P (A and B) = P(A) * P(B|A)

If the sum of the probabilities of all possible outcomes of an event is 1, what is the probability of an impossible event?

• 0

• 1

A bag contains 5 red balls and 3 green balls. If two balls are drawn at random, what is the probability that both are green?

A fair die is rolled. What is the probability of rolling a number greater than 4?

A fair die is rolled twice. What is the probability of getting a sum of 9?

If the odds of winning a game are 1:4, what is the probability of winning?

If a jar contains 10 white, 5 red, and 15 blue marbles, what is the probability of drawing a red marble?