Theoretical Probability

What is the formula to calculate probability?

• $\Pr\left(event\right)=\frac{number\ of\ possible\ outcomes}{total\ number\ of\ outcomes}$

• $\Pr\left(event\right)=\frac{total\ number\ of\ outcomes}{number\ of\ possible\ outcomes}$

• $\Pr\left(event\right)=\frac{number\ of\ possible\ outcomes}{total\ number\ of\ outcomes}\ \times100\%$

• Probability is the process of being lucky and guessing the answers.

What is the probability of spinning yellow?

• 1/11

• 1/12

• 1/4

• 3/4

Tags

CCSS.5.NF.B.3

There are a numbers from 4 to12 written on separate cards and placed into a hat. What is the sample space?

(a)  

There are a numbers from 4 to12 written on separate cards and placed into a hat. What is the probability of an even number being picked?

• $\frac{4}{9}$

• $\frac{1}{2}$

• $\frac{5}{9}$

• $\frac{1}{3}$

There are a numbers from 4 to12 written on separate cards and placed into a hat. What is the probability of a number less than 10 being picked?

• $\frac{2}{3}$

• $\frac{7}{9}$

• $\frac{5}{9}$

• $0$

There are a numbers from 4 to12 written on separate cards and placed into a hat. What is the probability a number being picked not being 12?

• $\frac{1}{9}$

• $1$

• $\frac{8}{9}$

• $\frac{11}{12}$

What is the sample space of this spinner?

• (1, 2, 3, 4, 5, 6, 7)

• 1 2 3 4 5 6 7

• (1 2 3 4 5 6 7)

What is the probability of yellow being spun?

•  $\frac{3}{7}$ 

•  $\frac{1}{7}$ 
  

•  $0$ 
  

• Yellow isn't an option.

What is the probability of 4 being spun (as a decimal)?

•  $\frac{1}{7}$ 

•  $0.5714$ 
  

•  $0.1428$  
  

What is the probability of not orange?

•  $\frac{1}{3}$ 

•  $0$ 
  

•  $1$