Engineering Probability

A fair six-sided die is rolled. What is the probability of rolling a 3?

• 1/4

• 1/6

• 1/3

• 1/2

A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If a marble is chosen at random, what is the probability of selecting a blue marble?

• 1/5

• 3/10

• 4/9

• 2/7

In a group of 50 students, 30 are girls and 20 are boys. If a student is selected at random, what is the probability of selecting a girl?

• 0.6

• 0.4

• 0.8

• 0.2

A spinner is divided into 8 equal sections, numbered 1 through 8. If the spinner is spun once, what is the probability of landing on an even number?

• 1/2

• 2/3

• 3/8

• 1/4

A box contains 4 red balls, 3 blue balls, and 5 green balls. If a ball is chosen at random, what is the probability of selecting a red or blue ball?

• 7/12

• 3/4

• 5/12

• 2/3

A standard deck of playing cards contains 52 cards. What is the probability of drawing a heart from the deck?

• 1/4

• 1/2

• 1/3

• 1/5

A bag contains 10 black socks and 8 white socks. If 2 socks are chosen at random, what is the probability that both socks are black?

• 10/18 * 10/17 = 100/306 = 10/17

• 10/18 * 9/17 = 45/153 = 5/17

• 10/18 * 8/17 = 40/306 = 4/17

• 8/18 * 7/17 = 56/306 = 7/17

A box contains 6 red balls and 4 blue balls. If 2 balls are chosen at random without replacement, what is the probability of selecting 2 red balls?

• 1/5

• 2/5

• 1/3

• 3/5

What is the probability of spinning green?

• 0
• 1/4
• 1/2
• 3/4

How do you write 0.02 as a percent?

• 20%
• 200%
• 2%
• .02%