Show:
Theoretical
Experimental
Predictions
Vocabulary
100
Maria is flipping a coin.  What is the theoretical probability the coin will land on heads?
What is 1/2, 0.5, or 50%?
100
Layla flipped a coin 10 times and landed on heads 4 times. What is the experimental probability of landing on heads?
What is 2/5, or 0.4, or 40%?
100

If you flip a coin 10 times, about how many times should it land on heads?

5
100
Define "probability."
The chance that an event will occur
200
The classic wood carousel at Carousel Park in Hampton, VA has 32 horses and 16 of them are standing horses. What is the probability of randomly selecting a standing horse?
What is 1/2, or 0.50, or 50%?
200
Jason rolled a die twenty times. He landed on 2 five times, 3 seven times,  6 two times, and 5 six times. What is the experimental probability of landing on 6?
1/10, 0.1, or 10%
200
You have a spinner with four equal sections that are blue, red, green, and yellow. If you spin it 100 times, about how many times should you land on yellow?
25 times
200
Define "experimental probability."
The probability of what actually occurs.
300
What is the probability of rolling a number greater than 2 with a standard number cube?
What is 2/3, or 0.66, or 66%?
300
A letter tile is randomly selected from a bag, recorded, and replaced 100 times. The results are listed below. What is the experimental probability of selecting the letter "E"? A = 16 E = 11 I = 29 O = 19 U = 25
11/100 or 0.11, or 11%
300
Trent has 30 marbles in a bag. The theoretical probability of choosing a green or blue marble is 1/2. How many marbles are blue or green?
15 blue or green marbles
300
Define "theoretical probability"
The probability that you expect to happen
400
There are 4 red marbles, 3 green marbles, and 1 yellow marble in a box. One marble is taken out of the box. What is the probability that the marble is red or yellow? 
What is 5/8, 0.625 or 62.5%?
400
Pedro recorded the types of birds that visit his bird feeder. Based on the results below, what is the probability the next bird will be a chickadee? Woodpecker = 3 Chickadee = 5 Cardinal = 1 Sparrow = 13 Blue Jay = 3
1/5, or 0.20, or 20%
400
There are 20 students in Ms. Williams class. The theoretical probability of choosing a female student to answer a question is 40%. How many girls are in the class?
8 girls
400

Describe how to find the difference between theoretical probability and experimental probability. 

Subtract the two probabilities! 

500
Jarvonya spins a spinner with 5 equal sections numbered 1-5. What is the probability she will spin and land on a composite number?
What is 1/5 or 0.2, or 20%?
500

Hasaan has a spinner with 5 equal sections, each a different color. After only 10 spins, the pointer had landed on red 40% of the time. After 1,000 spins, the pointer landed on red only 22% of the time. 

Explain why the probability changed.

As the number of trials increase, the experimental probability reaches closer to the theoretical probability. (The Law of Large Numbers)

500
Carley has a 0.2 chance of winning Ms. Williams raffle. If there are 30 tickets in the bucket, how many of the tickets have Carley's name on it?
6
500

What is the Law of Large Numbers?

the more trials done in an experiment, the closer experimental probability is to theoretical probability.