Probability
Sample Space
Disjointed Events
Independent Events
Making Predictions
100
Determine whether each event is impossible, unlikely, equally likely, likely, or certain: rolling a sum of 12 with two number cubes
unlikely
100
Lucia flips two quarters at the same time. How many possible outcomes are there?
4 possible outcomes
100
Tina has 24 U.S. stamps, 10 Canadian stamps, and 6 Mexican stamps. If she chooses a stamp at random, what is the probability that she will choose a Canadian or Mexican stamp?
2/5 or 40%
100
There are 4 red marbles, 3 green marbles, 6 blue marbles, and 2 black marbles in a bag. What is the probability that Angie will pick a green marble and then a black marble after replacing the first marble?
2/25 or 8%
100
A spinner is divided into 3 equal sections with the colors red, yellow, and blue. If you spin the spinner 30 times, how many times do you expect it to land on red?
10 times
200
Determine whether each event is impossible, unlikely, equally likely, likely, or certain: rolling a sum of 24 with two number cubes
impossible
200
Ren and Marisa play a round of Rock/Paper/Scissors. How many possible outcomes are there?
9 possible outcomes
200
What is the probability of choosing either an E or a Y from the letters in the word "freeway"?
3/7
200
What is the probability of flipping a coin and getting heads and then rolling a 6 on a number cube?
1/12
200
Based on a sample survey, about 2% of the items produced by a company are defective. Out of 5,000 items, how many can you predict will be defective?
100 items
300
Of Sami's first 15 grades, 10 have been an A. What is the probability that her next grade will not be an A?
1/3 or around 33%
300
In a game, each player rolls a number cube and spins a spinner. The spinner is divided into thirds, numbered 1,2, and 3. How many possible outcomes are there?
18 possible outcomes
300
What is the probability of drawing a blue marble or a green marble from a bag that contains only 3 red marbles, 5 green marbles, and 6 blue marbles?
11/14
300
A weather report states that there is a 20% chance of rain on Saturday and an 80% chance of rain on Sunday. If the chance of rain on Sunday is independent of the chance to rain on Saturday, what is the probability that it will rain on both days?
16%
300
If you roll a fair number cube 50 times, how many times can you expect to roll an even number?
25 times
400
Find each probability. Write your answer as a ratio, as a decimal, and as a percent. There are 9 girls and 12 boys on the student council. What is the probability that a girl will be chosen as president?
3/7, about 0.42, about 43%
400
There are two spinners. The first spinner has 3 equal sides with the colors red, white, and blue. The second spinner has 4 equal sides with numbers 1,2,3, and 4. How many possible outcomes are there?
12 possible outcomes.
400
What is the probability of rolling a number less than 2 or greater than 5 on a number cube?
1/3
400
A card is chosen randomly from a set of cards labeled with the numbers 1 through 8. A second card is chosen after the first card is replaced. What is the probability that both cards will be labeled with even numbers?
1/4 or 25%
400
In a sample survey, 500 teenagers indicated that 175 of them use computers regularly. Out of 4,500 teenagers, predict how many use their computers regularly.
1,575 teenagers
500
Find each probability. Write your answer as a ratio, as a decimal, and as a percent. Jefferson chooses a marble from a bag containing only 6 blue, 9 white, 3 orange, and 11 green marbles. What is the probability that he will select a green marble?
11/29, about 0.38, about 38%
500
There are two spinners. The first spinner has 3 equal sides with the colors red, white, and blue. The second spinner has 4 equal sides with numbers 1,2,3, and 4. What is the theoretical probability of each outcome?
1/12
500
What is the probability of choosing a green bead or purple bead from a box that holds only 10 green beads, 18 purple beads, and 14 blue beads?
2/3
500
On a multiple-choice test, each question has 5 possible answers. A student does not know the answers to two questions, so he/she guesses. What is the probability that the student will get both answers wrong?
16/25 or 64%
500
In a sample survey, 100 6th graders indicated that 20 of them take music lessons. Out of 500 6th graders, predict how many take music lessons.
100 6th graders
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