Vocabulary
What do we call the chance that something will happen?
Probability
Convert 0.4 to a percent.
40%
What is the probability of rolling a 6 on a fair 6-sided die?
1/6
Are flipping a coin and rolling a die independent or dependent events?
Independent
A box has 10 pencils, 2 are broken. What is the probability of pulling a pencil that’s not broken?
8/10 = 4/5
What do you call a result of a probability experiment?
Outcome
Convert 75% to a fraction in simplest form.
3/4
A bag has 2 red, 3 blue, and 1 green marble. What is the probability of drawing a blue?
3/6 or 1/2
What’s the probability of flipping a coin and getting heads, then flipping again and getting tails?
1/2 × 1/2 = 1/4
There are 6 apples: 2 red, 2 green, 2 yellow. What is the probability of choosing a green or yellow apple?
4/6 = 2/3
What are all the possible outcomes called?
Sample space
Convert 3/5 to a decimal.
0.6
A spinner has 4 equal sections: 2 red, 1 blue, 1 yellow. What is the probability of landing on yellow?
1/4
You draw a card from a deck, don’t put it back, then draw again. Is this independent or dependent?
Dependent
A class of 24 students has 10 boys. What’s the probability of picking a girl at random?
14/24 = 7/12
What type of event is flipping a coin and getting heads?
Random event
Which is greater: 2/3 or 65%?
2/3 (≈66.7%)
What is the probability of picking a vowel from the word "MATH"?
1/4 (Only "A" is a vowel)
What is the probability of rolling two 6-sided dice and getting two 3s?
1/6 × 1/6 = 1/36
A bag has 3 green, 2 purple, and 1 pink marble. What’s the probability of pulling pink, then purple (no replacement)?
1/6 × 2/5 = 2/30 = 1/15
What’s the difference between theoretical and experimental probability?
Theoretical is what should happen (based on math); Experimental is what actually happens when you try it.
Convert 0.875 to a fraction in simplest form.
7/8
A number is chosen at random from 1 to 10. What is the probability it’s a multiple of 3?
3/10 (3, 6, 9)
A jar has 3 red and 2 blue marbles. Without replacing, what’s the probability of pulling red, then blue?
3/5 × 2/4 = 6/20 = 3/10
There are 5 shirts (2 red, 3 blue) and 4 pants (2 jeans, 2 khakis). How many outfit combinations are possible?
5 × 4 = 20 combinations