Simple Probability
If a single coin is flipped, what is the probability that the coin lands on HEADS?
1/2 or 50%
If a coin is flipped six times, how many times would you predict the coin will land on HEADS?
1/2 times 6 = 3
A coin is flipped Five times. It lands on HEADS Twice. What is the Experimental Probability of landing on HEADS?
2/5 or 40%
Becky goes to the store to buy shoes and a jacket. There are red and blue shoes and green and black jackets. Create the list or tree diagram for this.
Red, Black
Blue, Green
Blue, Black
If two coins are flipped, what is the probability that both coins lands on HEADS?
1/2 × 1/2 = 1/4 or 25%
If a six-sided dice is rolled, what is the probability of rolling a THREE or FIVE?
2/6 or 1/3 or 33%
If a six-sided dice is rolled 30 times, how many times would you predict the dice to land on THREE?
1/6times30=5
A six-sided dice is rolled ten times. Not once did it land on ONE.
What is the experimental probability of the dice landing on a ONE?
0/10 or 0%
How outcomes are possible if I roll a dice and then throw a disk?
12 outcomes
If two six-sided die are rolled, what is the probability of rolling double THREEs?
1/6 times 1/6 = 1/36 or 2.8%
Three RED blocks and Seven GREEN blocks are in a pile together.
What is the probability that a RED block is pulled from the pile?
3/10 or 30%
Three RED blocks and Seven GREEN blocks are in a pile together.
If you pull 20 blocks from the pile and put each block back after each pull, how many times would you predict a RED block is pulled?
3/10times20=6
Three RED blocks and Seven GREEN blocks are in a pile together.
After 7 attempts, a RED block is only pulled once.
What is the Experimental Probability of pulling a RED block?
1/7 or 14%
How many outcomes are possible there are 4 bread types and 6 types of fillings?
24 outcomes
Three RED blocks and Seven GREEN blocks are in a pile together.
What is the probability that two RED blocks are pulled from the pile if the first RED block is put back into the pile after the first pull?
3/10times3/10=9/100 or 9%
If a card is pulled at random from a deck, what is the probability the card pulled is a QUEEN?
4/52 or 1/13 or 7.7%
If a card is pulled at random from a deck 52 times, and that card is returned each time, how many times would you predict to pull a QUEEN?
1/13times52=4
Ten cards from a deck of playing cards are pulled at random and removed from the deck. The following cards were pulled:
2D 10C QS 7H 4C QH AD 8S 9H 3H
What is the Experimental Probability from the ten cards pulled that a HEARTS was pulled?
4/10 or 40%
How many outcomes are possible if you have 2 deserts, 2 dinners, and 2 drinks to pick from?
8 total outcomes
If two cards are pulled at random from a deck, what is the probability both cards pulled are QUEENs?
Remember that once a card is pulled out, it is NOT returned to the deck.
4/52times3/51=12/2652=1/221 or 0.45%
Seventeen student are in a classroom. There are 6 BOYS and 11 GIRLS.
What is the probability that a GIRL is selected at random?
11/17 or 64.7%
Seventeen student are in a classroom. There are 6 BOYS and 11 GIRLS.
If you pull students at random 102 times, how many times do you predict a GIRL is pulled from the group?
11/17times102=66
Seventeen student are in a classroom. There are 6 BOYS and 11 GIRLS.
During a week, 30 trips were made to the restroom, 14 trips from the BOYS and 16 trips from the GIRLS.
What is the Experimental Probability that a GIRL asks to use the restroom?
16/30 or 8/15 or 53%
How many outcomes are possible if there are 4 car types, 6 colors, and 2 interiors?
48 outcomes
Seventeen student are in a classroom. There are 6 BOYS and 11 GIRLS.
What is the probability that two GIRLs are selected at random?
Remember to reduce the total number of students and the total number of GIRLs from your calculations by one after the first pull.
11/17times10/16=110/272=55/136 or 40.4%