Probability Warm Up

Which of the following is Theoretical Probability?

• What happened in my experiment.

• The chances of something happening (prediction). Rolling a 3 is a 1/6 chance.

• I rolled a 3 five times out of 8 tosses

• Relative Frequency (use a frequency table)

Which of the following is Experimental Probability? Select ALL that apply.

• What happened in my experiment.

• The chances of something happening (prediction). Rolling a 3 is a 1/6 chance.

• I rolled a 3 five times out of 8 tosses

• Relative Frequency (use a frequency table)

What is the EXPERIMENTAL Probability of rolling a 3?

• 5

• 1/10

• 1/4

• 1/16

What is the THEORETICAL Probability of rolling a 5 OR 6?

• 1/2

• 3/10

• 1/4

• 1/3

Find the EXPERIMENTAL Probability of rolling a 5 or a 6:

• 3/10

• 1/3

• 1/5

• 1/10

On Monday the following books were returned to the library: 5 mystery book, 3 non-fiction, 7 picture books and 2 science fiction.

What is the EXPERIMENTAL Probability that the NEXT book will be a picture book? (as a fraction)

Anna spins the spinner.

What is the THEORETICAL Probability of landing on C?

• 1/4

• 20%

• 8

• 4/15

Anna spins the spinner 30 times. It lands on C (8 times).

What is the EXPERMINENTAL Probability of landing on C?

• 25%

• 1/5

• 8/30 = 4/15

• 8

Anna should have spun C 20% of the time. She actually spun C about 26% of the time. What would you expect to happen to the Experimental Probability Percent if she spun 100 times instead of 30?

• Her Experimental Probability should get closer to the TP 20%

• She will still spin C about 26% of the time

• No way to know! It's just chance!

Anna Spun this spinner 100 times. According to THEORETICAL Probability, how many times would you expect her to spin red?

• 1 times

• 25 times

• 50 times

• 100 times