Intro Probability Quiz

Show your work then answer then select your answer

• a

• b

• c

• d

Answer explanation

You should've set up a proportion with one ratio being 2/25 = x/800 and solve for "x".

Show the strategies taught and select your answer.

• a

• b

• c

• d

3. Randy has two piles of sports cards. Each pile contains 15 cards.

• Pile A has 6 baseball cards and 9 football cards.

• Pile B has 11 baseball cards and 4 football cards.

Which statement is true?

• a. The probability of randomly selecting a baseball card from Pile A is greater than the probability of randomly selecting a baseball card from Pile B.

• b. The probability of randomly selecting a baseball card from Pile A is less than the probability of randomly selecting a baseball card from Pile B.

• c. The probability of randomly selecting a football card from Pile A is less than the probability of randomly selecting a football card from Pile B.

• d. The probability of randomly selecting a baseball card from Pile A is less than the probability of randomly selecting a football card from Pile B

• a. The first pitched ball is more likely to be white than orange.

• b. The first pitched ball is more likely to be yellow than green.

• c. The first pitched ball is twice as likely to be white than yellow.

• d. The first pitched ball is 2.5 times as likely to be yellow than orange.

5. The members of the Science Club are Caleb, Ann, Trish, Aisha, DeSean, and Binh. They all randomly draw straws to determine which member will give the demonstration at the science fair. Which simulation could be used to determine the probability that Ann will give the demonstration?

• a. Toss a coin one time.

• b. Spin a spinner with 4 equal sections one time.

• c. Roll a six-sided fair number cube one time.

• d. Pick a card at random from 10 cards one time.

Answer explanation

Remember a simulation has to have the same number of outcomes as the real-life situation.

6. A bag contains 6 cards, each with a number on it. The numbers are 1, 4, 7, 8, 11, and 14. What is the probability of selecting a number that is a multiple of 7. 6. A bag contains 6 cards, each with a number on it. The numbers are 1, 4, 7, 8, 11, and 14. Calculate the probability of the of this event as a fraction in simplest terms.

• 4/6

• 2/3

• 2/6

• 1/3

Answer explanation

Simplify your fractions if possible. You can use your multiplication chart to help you.

8. Meghan has not been pairing her socks, and she now has a drawer of mismatched socks. Her drawer has 7 black socks, 6 white socks, 2 purple socks, and 5 yellow socks. a. Suppose Meghan reaches into her drawer without looking and randomly selects one sock. What is the probability of selecting each of the different colored socks in her drawer? Write each probability as a fraction in simplest terms.

• P(purple)

• 2/20=1/10

• P(black)

• 6/20=3/10

• P(yellow)

• 5/20=1/4

• P(white)

• 7/20

Match the following

Meghan has not been pairing her socks, and she now has a drawer of mismatched socks. Her drawer has 7 black socks, 6 white socks, 2 purple socks, and 5 yellow socks.

Predict the number of socks of each color you would get if you chose a sock from the drawer without looking 40 times, replacing each sock before the next selection. Match the correct proportion to the answer.

• There would be 12 white socks.

• She would have 4 purple socks

• She would pick

  14 black socks after 40 picks

• There would be 10 yellow socks.