Experimental probability and expected frequency Quiz

1. A coin lands on heads 27 times in 50 flips. What is the relative frequency of heads?

• A. $0.27$
• B. $0.5$
• C. $0.54$
• D. $1.85$

2. The probability that a seed grows is 0.8. How many of 250 seeds are expected to grow?

• A. $200$
• B. $20$
• C. $50$
• D. $250$

3. Which gives the most reliable estimate of the probability that a drawing pin lands point up?

• A. 10 flips
• B. 50 flips
• C. 100 flips
• D. 2000 flips

4. A fair die is rolled 120 times. About how many 4s are expected?

• A. $24$
• B. $40$
• C. $30$
• D. $20$

5. A spinner has four equal sections. In 400 spins, one colour appears 140 times. What is the best conclusion?

• A. The spinner is fair because 140 is close to 100.
• B. It is impossible to tell anything from this result.
• C. The spinner is probably biased because 140 is much higher than the 100 expected.
• D. The spinner must be broken because 140 is not a multiple of 4.