Lesson 1: Probabilities of Single Step Events — Practice Questions

1. 1. A spinner is spun 40 times and lands on the color red 15 times. What is the experimental probability of landing on red, expressed as a simplified fraction? ___

2. 2. A quality inspector checks 200 light bulbs and finds that 7 are defective. What is the experimental probability of a light bulb being defective, expressed as a decimal? ___

3. 3. A student surveyed 80 classmates about their favorite pet. If 36 students chose "dog", what is the experimental probability that a randomly chosen classmate's favorite pet is a dog?

   • A. $\frac{9}{20}$
   • B. $\frac{4}{5}$
   • C. $\frac{1}{2}$
   • D. $\frac{11}{20}$

4. 4. An experiment was conducted 25 times and the desired event occurred 8 times. Based on this data, what is the experimental probability of the event, expressed as a decimal? ___

5. 5. Which of the following best defines experimental probability?

   • A. A probability based on what is expected to happen in theory.
   • B. A probability based on the results of actual trials.
   • C. The total number of trials in an experiment.
   • D. The number of times a specific event occurs.

6. 6. Which of the following numbers cannot represent the probability of an event?

   • A. 0
   • B. 1
   • C. $\frac{3}{4}$
   • D. 1.1

7. 7. A standard six-sided die is rolled. What is the probability of rolling a number greater than 6? The answer is ___.

8. 8. An event that is certain to happen has a probability of ___.

9. 9. An event has a probability of $\frac{1}{10}$. How would you describe the likelihood of this event occurring?

   • A. Likely
   • B. Unlikely
   • C. Certain
   • D. Equally likely as not

10. 10. When rolling a standard die, the probability of rolling a number that is an integer is ___.