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Alan B

on 25 January 2010

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Transcript of 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
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