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This printable supports Common Core Mathematics Standard 7.SP.C.7.A

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# Uniform Probability Models (Grade 7)

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## Uniform Probability Models

1.
A group of students are playing a game of chance. If there are 3 guys in the class and 6 girls, what of the sample spaces below represent the situation accurately if each A represents a guy and each B represents a girl?
1. {A, B}
2. {A, B, B}
3. {A, A, A, B, B, B, B, B, B}
4. All of the above
2.
A teacher is looking over a class of students in order to pick someone to solve a question on the whiteboard. There are 27 students in the class and 9 of them are boys. If the teacher picks a student at random, what is the chance of her picking a specific girl named Charlotte if all the students have an equal probability of being picked?
1. $2/3$
2. $1/27$
3. $1/9$
4. $1/3$
3.
If the spinner is spun once, what is the chance of it landing on a 3 or 5 if each space has an equal probability of being landed on?
1. $5/3$
2. $1/3$
3. $3/5$
4. $1/6$
4.
A board game has 5 red spaces, 10 blue spaces, and 15 green spaces on it. If a dice is rolled onto the board, what is the chance it will land on a green or blue space if each space has an equal probability of being landed on?
1. $5/6$
2. $1/2$
3. $2/3$
4. $1/6$
5.
If a dice is rolled once, what is the probability of rolling a number higher than 3 if all outcomes have an equal probability?
1. $1/2$
2. $2/3$
3. $1/3$
4. $1/4$
6.
A closet full of dresses has 3 red dresses, 4 blue dresses, 2 green dresses, and 1 black dress. What is the probability of picking out a blue or black dress if a dress is picked out of the closet at random and each dress has an equal probability of being picked?
1. $1/5$
2. $1/10$
3. $2/5$
4. $1/2$
7.
If the spinner is spun once, what is the chance of it landing on green if each color has an equal probability of being landed on?
1. $1/2$
2. $1/3$
3. $1/4$
4. $3/4$
8.
If a die is rolled once, what is the chance of rolling a 5 if each side does not have an equal probability of being picked?
1. $1/6$
2. $1/5$
3. $1/3$
4. You can't know exactly
9.
A teacher is looking over a class of students in order to pick someone to solve a question on the whiteboard. There are 27 students in the class and 18 of them are girls. If the teacher picks a student at random, what is the chance of a boy being picked if all the students have an equal probability of being picked?
1. $2/3$
2. $1/2$
3. $1/3$
4. $1/9$
10.
A video game world is being generated using randomization. The video game tries to generate a castle every 300 yards in the game, and selects a random castle from a list of 30 different castles. If 10 of the castles are tall castles and 1 of the tall castles is an obsidian castle, what is the probability of the game picking a tall castle, and what is the chance of the game picking a tall obsidian castle, in that order?
1. $1/3$ , $1/10$
2. $1/10$ , $1/30$
3. $1/30$ , $1/3$
4. $1/3$ , $1/30$
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