Simple Probability
If a single coin is flipped, what is the probability that the coin lands on HEADS?
1/2 or 50%
A coin is flipped Five times. It lands on HEADS Twice. What is the Experimental Probability of landing on HEADS?
2/5 or 40%
If two coins are flipped, what is the probability that both coins lands on HEADS?
1/2 × 1/2 = 1/4 or 25%
3! / 2!
3
There are 12 athletes at a track meet. How many different ways can they finish first or second?
132
If a six-sided dice is rolled, what is the probability of rolling a THREE or FIVE?
2/6 or 1/3 or 33%
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%
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%
4! / (2! x 2!)
6
A student council needs to choose 3 students from a group of 8 students to represent their class.
How many different combinations of 3 students can be chosen?
56
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.
After 7 attempts, a RED block is only pulled once.
What is the Experimental Probability of pulling a RED block?
1/7 or 14%
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%
4! + 4!
48
There are 29 students in a homeroom. How many different ways can they be chosen to be elected President, Vice President, and Treasurer?
21,924
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%
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%
If two cards are pulled at random from a deck, what is the probability both cards pulled are QUEENs?
4/52times3/51=12/2652=1/221 or 0.45%
5! - 3! + 2!
116
A pizza shop offers 6 different toppings.
You want to choose 2 toppings for your pizza.
How many different topping combinations can you make?
15
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.
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%
Seventeen student are in a classroom. There are 6 BOYS and 11 GIRLS.
What is the probability that two GIRLs are selected at random?
11/17times10/16=110/272=55/136 or 40.4%
6! - 4! x 2!
672
Ariana has 4 posters she wants to hang on the wall. How many different ways can the posters be arranged in a row?
24