Which probability describes an event that is unlikely but possible?
A bag holds marbles as shown. One marble is picked at random.
What is the probability of picking a blue marble?
The spinner has 8 equal sectors.
What is the probability of landing on a number less than 3?
The bar chart shows the results of 40 spins.
What is the experimental probability of blue?
The probability that a train is late is 0.3. What is the probability that the train is not late?
The probability of landing on red is \(\frac{2}{5}\). About how many reds should be expected in 150 spins?
Which list could be a probability model for three outcomes?
Ava rolled a cube 60 times. If the cube is fair, each face is expected 10 times.
Which face is farthest from the expected count?
A fair number cube is rolled once. What is the probability of rolling a prime number?
A paper cup landed on its side 41 times in 100 tosses. About how many side landings should be expected in 200 tosses?
🎉 Quiz complete!
Remember:
- Probability 0 means impossible, 1 means certain, and \(\frac{1}{2}\) means as likely as not.
- Theoretical probability = favorable outcomes divided by possible outcomes (equally likely).
- Experimental probability = number of times it happened divided by number of trials.
- In every probability model the probabilities add to 1; a uniform model has equal probabilities.
- Expected count = probability times number of trials; compare it with the observed count.
See every chapter on the Grade 7 math page.