Basic Probability
Predictions Using Probabilities
Experimental vs. Theoretical Probability
Counting Outcomes
Compound Probability
100
This is the probability, in simplest form, of rolling an even number on a die 
What is 1/2?
100
Of 10 people at the park, 4 really like the new playground. Use the information to predict how many out of 100 people would really like the new playground.
40 out of 100 people
100

What is the theoretical probability of landing on an odd number when rolling a dice?

1/2

100
Shakes come in small, medium, and large. The flavors are vanilla, chocolate, strawberry, and caramel. What are the number of possible ways to order a shake? (flavor and size combinations) 
What is 12?
100

You roll a dice and then flip a coin. What is the probability of rolling a 4 and then landing on heads?

1/12

200
You and four friends order food at a restaurant. This is the probability that your food will be served first.
What is 1/5?
200
If 12 people out of 50 saw the new movie with Reese Witherspoon, how many people out of 1,000 would you expect to see the movie?
240
200

If Tonya rolled a dice 15 times and landed on an even number 5 times, what is the experimental probability of landing on an even number?

1/3

200
A truck comes in 2-door, extended-cab, and 4-door models. The available colors are black, red, white, green, and blue. This is the number of ways the manufacturer can produce the truck.
What is 15?
200

You spin a spinner with red, blue, green and yellow and then roll a dice. What is the probability of spinning a yellow and then landing on an even number?

1/8

300
This is the probability, in simplest form, of rolling greater than 2 on a ten-sided die numbered 1-10.
What is 4/5?
300
If 14 of 40 students are interested in participating in athletics, how many out of 420 would you expect to be interested in athletics?
The ratio 14/60 is equal to the ratio x/420; where x equals the number of students your would expect to be interested in athletics. Solve the ratio and you get the answer! 98 students would be interesting in athletics
300

Taylor spun a spinner 21 times with equal sections of blue, green, red and yellow. If she landed on yellow 6 times, was the experimental probability or theoretical probability of landing on yellow higher?

Experimental (6/21 is higher than 1/4)

300
M&Ms come in blue, green, brown, red, yellow, and orange. One conveyer makes plain, peanut, pretzel, and dark. This is the number of M&Ms the conveyer makes.
What is 24?
300

You draw a card from a deck, put it back, and then draw another card. What is the probability of drawing a diamond and then an ace?

1/52

400
A bag has seven Snickers and three Milky Way bars. This the probability of pulling out a Snickers?
What is 7/10?
400
For every 75 light bulbs produced at a factory, 2 are defective. In a box of 300 light bulbs, how many would likely be defective?
Ratio 2/75 = x/300 Solve the ratio and you get 8 defective light bulbs.
400

Matt flipped a coin 43 times and landed on heads 19 times. Which was greater: the experimental or theoretical probability of landing on heads?

Theoretical (1/2 is greater 19/43)

400
A shirt comes in s, m, l, and xl. The colors are black, blue, green, red, orange, yellow, pink, and white. This is the number of shirt choices a store must carry.
What is 32?
400

You have a box of 12 green ornaments, 13 red, and 10 glittery. What is the probability of selecting a green, putting it on the tree, and then selecting a red?

78/595 or 13.1%

500
The letters A through I are placed in a bag. This is the probability of drawing D.
What is 1/9?
500
At the school carnival, Jesse won the balloon dart game 1 out of every 5 times he played. If he plays another 15 times, about how many times can he expect to win?
3
500

In a complete sentence, how would you describe the difference between theoretical and experimental probability?

Theoretical probability is the mathematical, calculated probability of an event occurring whereas experimental probability is calculated based on actual results from an actual experiment.

500
As a movie tie-in, three soft drinks have a dozen different character cans. This is the number of different cans the manufacturer must produce.
What is 36?
500

You put your name in a raffle with 31 other names (each name is only in once). What is the probability that your name will get selected first and your friends name selected next? 

1/992 or 0.1% 

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