Basic Probability
A bag has 3 red marbles and 2 blue marbles. What is the probability of picking a red marble?
3/5
Flipping a coin 25 times and recording results is what type of probability?
Experimental
What is an outcome?
A possible result of an event
A jar has 4 red and 6 blue marbles. What is P(red)?
4/10 (or 2/5)
What is probability used for in weather forecasts?
Predicting chance of rain/sun/snow
A coin is flipped. What is the probability of getting heads?
1/2
What type of probability is based on math and all possible outcomes?
Theoretical
What is an event?
An action; A set of outcomes or result you are interested in
A class has 10 boys and 10 girls. What is P(picking a girl)?
10/20 (or 1/2)
If something has a 90% chance of happening, is it likely or unlikely?
Likely
A spinner has 10 equal sections. 4 are green. What is the probability of landing on green?
4/10 (or 2/5)
A spinner says you should land on red 1/4 of the time. This is what type?
Theoretical
What does favorable outcome mean?
The outcome you want
A bag has 3 candy, 2 chips, and 5 cookies. What is P(chips)?
2/10 (or 1/5)
Why do games use probability?
To decide fairness/chances of winning
A number cube (1–6) is rolled. What is the probability of rolling a number greater than 4?
2/6 (or 1/3)
You roll a die 10 times and get mostly 6s. What type of probability is this?
What is probability?
The chance something will happen
A spinner has 8 sections: 2 red, 3 blue, 3 green. What is P(red or blue)?
5/8
Give one real-life example of probability.
Weather, sports, games, lotteries, etc.
A bag has 5 green, 3 red, and 2 blue marbles. What is probability of getting a marble that is NOT red?
7/10
What is one difference between experimental and theoretical probability?
Experimental uses trials/data; theoretical uses math/possible outcomes
What does “equally likely” mean?
All outcomes have the same chance
A box has 6 pencils, 4 pens. You pick one item. What is P(not a pen)?
6/10 (or 3/5)
A doctor says there is a 1 in 100 chance of a side effect. Is that likely or unlikely?
Unlikely