Year 7 - Probability and Expected Outcomes

What is the experimental probability of getting a 5?

• $\frac{3}{12}=\frac{1}{4}=0.25$

• $\frac{2}{12}=\frac{1}{6}=0.167$

• $\frac{6}{12}=\frac{1}{2}=0.50$

• 0

What is the experimental probability of getting an odd number?

•  $\frac{6}{12}=\frac{1}{2}=0.50$ 

•  $\frac{8}{12}=\frac{2}{3}=0.667$ 

•  $\frac{4}{12}=\frac{1}{3}=0.333$ 

• 0

How many times would you expect to get an odd number if you spin 150 times?

• 50

• 150

• 75

• 100

How many people participated in the survey?

• 35

• 20

• 50

• 60

What is the probability that a random participant watches less than 5 hours of TV?

• $\frac{30}{50}=\frac{3}{5}=0.60$
  

• $\frac{40}{50}=\frac{4}{5}=0.80$
  

• $\frac{10}{50}=\frac{1}{5}=0.20$

• $\frac{20}{50}=\frac{2}{5}=0.40$

What is the probability that a random participant watches 20-30 hours of TV?

•  $\frac{5}{50}=\frac{1}{10}=0.10$ 
  

•  $1$ 
  

•  $0$ 

•  $\frac{45}{50}=\frac{9}{10}=0.90$ 

What is the probability that a random participant watches between 5 and 20 hours of TV?

•  $\frac{15}{50}=\frac{3}{10}=0.30$ 
  

•  $1.0$ 
  

•  $\frac{30}{50}=\frac{3}{5}=0.60$ 

•  $\frac{20}{50}=\frac{2}{5}=0.40$ 

Based on this survey, the experimental probability of someone watching 30+ hours of TV is 0. Does this mean that watching 30+ hours is impossible?

• Yes, it is impossible for anyone to watch that much TV.

• No, just nobody within the surveyed group watched that much.

What is the theoretical probability of rolling a 3?

• $\frac{1}{3}$

• $\frac{1}{6}$

• $\frac{2}{3}$

• $\frac{5}{6}$

How many times would you expect to get a 3 in 600 trials?

• 50

• 100

• 300

• 600