Probability

Of the 45 students in a class, 25 are boys. If a student is selected at a random for a field trip, what is the probability of selecting a girl?

• 3/8

• 4/5

• 2/7

• 4/9

What percent of the total population surveyed were electrical engineers that like math?

• 33.9%

• 48.6%

• 16.5%

• 21.7%

Ricardo has the spinner pictured here and a bag of marbles filled with 2 red marbles, 3 green marbles, and 3 blue marbles. What is the probability that Ricardo spins red on the spinner and picks a red marble out of the bag?

• 1 ⁄ 16

• 1 ⁄ 2

• 1 ⁄ 4

• 1 ⁄ 8

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?

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

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

A box contains 3 red balls and 2 blue balls. If two balls are drawn at random, what is the probability that both are red?

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

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