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# Probability

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#### Transcript of Probability

Probability

Probability is the likelyhood of an event

All probability exists between 0 and 1.

0 means something isn't going to happen

1 means something is going to happen. Outcome is the result of an experiment. An experiment is 'doing something'

-flipping a coin

-rolling a number cube

-spinning a spinner Sample space are the total amount of outcomes:

- for instance a coin's sample space is 2

- a number cube's sample space is 6 (6 sides)

A spinner with 4 equal sections has a sample space of 4

Event - a subset of the sample space.

For instance - landing on a head is an event in a coin toss.

The other possible event would be tails Theoretical probability Ratio of the possible ways an event can happen. For instance a coin toss has a theoretical probability of 1/2. Rolling a 2 on a number cube would have a probability of 1/6. What is the sample space?

What event are you waiting on? How many total possible outcomes? What is the probability? Question 1 in clicker Answer was A.

Add all together to get the sample space.

Sample space is 57

12/57 = 0.21

4/19 = 0.21

The P(Red)= 4/19 Question 2 in clicker

Answer was B

All probability has to be

between 0 and 1.

-2 wasn't between 0 and 1

160% is 1.6 as a decimal

2 isn't between 0 and 1 The answer was C The reason it was c is that all of the students were 8th

graders - so there was a 100% chance that the student

selected would be an 8th grader (100% = 1 as a decimal) Question 3 Question 4 Answer was A

There were no pentagons - so there was no chance of drawing one. The answer was B

All probability must exist between 0 and 1.

15% = 0.15

150% - 1.5

1500% = 15

Question 5 Question 6 The answer was B.

There were 4 colors - so the answer should be close to 1/4 or 0.25

0.23 is very close to 1/4

Full transcriptProbability is the likelyhood of an event

All probability exists between 0 and 1.

0 means something isn't going to happen

1 means something is going to happen. Outcome is the result of an experiment. An experiment is 'doing something'

-flipping a coin

-rolling a number cube

-spinning a spinner Sample space are the total amount of outcomes:

- for instance a coin's sample space is 2

- a number cube's sample space is 6 (6 sides)

A spinner with 4 equal sections has a sample space of 4

Event - a subset of the sample space.

For instance - landing on a head is an event in a coin toss.

The other possible event would be tails Theoretical probability Ratio of the possible ways an event can happen. For instance a coin toss has a theoretical probability of 1/2. Rolling a 2 on a number cube would have a probability of 1/6. What is the sample space?

What event are you waiting on? How many total possible outcomes? What is the probability? Question 1 in clicker Answer was A.

Add all together to get the sample space.

Sample space is 57

12/57 = 0.21

4/19 = 0.21

The P(Red)= 4/19 Question 2 in clicker

Answer was B

All probability has to be

between 0 and 1.

-2 wasn't between 0 and 1

160% is 1.6 as a decimal

2 isn't between 0 and 1 The answer was C The reason it was c is that all of the students were 8th

graders - so there was a 100% chance that the student

selected would be an 8th grader (100% = 1 as a decimal) Question 3 Question 4 Answer was A

There were no pentagons - so there was no chance of drawing one. The answer was B

All probability must exist between 0 and 1.

15% = 0.15

150% - 1.5

1500% = 15

Question 5 Question 6 The answer was B.

There were 4 colors - so the answer should be close to 1/4 or 0.25

0.23 is very close to 1/4