Review Probability

A bag has 3 red marbles, 2 blue and 4 green and 1 yellow. What is the theoretical probability of pulling a red, P(red)? (a)  

• 3/10
• 3/9
• 1/10
• 1/9

Probability can be written as ...

• P(outcome)

• P(total)

• E(outcome)

• E(total)

Probability ranges from 0 or 0% (impossible) to 1 or 100% (certain). (a)  

• true
• false

Expected Value:

Papa Johns wants to determine how often it delivers to three different areas of Twinsburg. The table shows the areas from a random sample of 80 deliveries. Based on this data, if the driver makes 200 deliveries, how many will be to the southern area of Twinsburg?

• 35

• 55

• 80

• 110

Theoretical Probability is?

• What Should happen
• What does happen
• What Will Happen
• What I want to Happen

Tags

CCSS.7.SP.C.5

Experimental Probability is:

• What Will happen 
• What actually happens
• What should happen
• What I think Happens

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.6

CCSS.7.SP.C.7

A spinner has 5 sections of equal size labeled P, Q, R, S, and T. The arrow of this spinner is spun 15 times and landed 4 times on the section labeled Q.
Which statement best describes the experimental probability and theoretical probability of the arrow landing on the section labeled Q? 

• The experimental probability is 4/15, and the theoretical probability is 1/5.
• The experimental probability is 1/5, and the theoretical probability is 1/5.
• The experimental probability is 4/15, and the theoretical probability is 4/15.
• The experimental probability is 1/5, and the theoretical probability is 4/15.

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.6

CCSS.7.SP.C.7

How do you calculate the expected value from a probability situation?

• multiply the probability of each outcome by its value, then add them all up

• add up the values of each outcome

Expected value of a probability model is written as ​​ ​ (a)   and is calculated by ​​ (b)   .

• E(x)
• the sum of P(x) · n
• P(x) · n
• P(outcome)

What is the expected value of the spinner?

• 6.25

• 6.5

• 4.75

• 13