4.5 Probability basics Quiz

1. A fair 8-sided die numbered 1 to 8 is rolled. Find the probability of a number greater than 5.

• A. $\frac{3}{8}$
• B. $\frac{5}{8}$
• C. $\frac{3}{5}$
• D. $\frac{1}{8}$

2. $P(A)=0.35$. Find $P(A')$.

• A. $0.35$
• B. $0.55$
• C. $0.65$
• D. $1.35$

3. A coin is tossed 80 times and lands on heads 46 times. The relative frequency of heads is

• A. $0.425$
• B. $0.5$
• C. $0.575$
• D. $0.54$

4. The probability that a flight is delayed is $0.12$. Out of 250 flights, the expected number of delays is

• A. $12$
• B. $30$
• C. $220$
• D. $21$

5. Two fair coins are tossed. How many outcomes are in the sample space?

• A. $2$
• B. $3$
• C. $8$
• D. $4$