Terminology
What term describes all possible outcomes of an experiment?
Sample space
If a die is rolled, what is the probability or rolling an even number (as a decimal number)?
0.5
A spinner has 8 equal sections. 3 are green. What is the probability of landing on green? Write your answer as a fraction.
3/8
A coin is flipped 10 times and lands on heads 6 times. What is the experimental probability of heads? Write your answer as a percentage?
60%
What is the probability of NOT picking a red ball if the probability of picking red is
3/5
2/5
What type of probability is calculated when the total number of favourable outcomes is compared to the total number of possible outcomes?
Theoretical probability
What is the chance that your birthday this year will fall on a Tuesday? Write your answer as a fraction.
1/7
A bag contains 5 red, 3 purple and 2 yellow balls. What is the probability of choosing a purple ball? Write your answer as a decimal.
0.3
A die is rolled 20 times. A 4 appears 5 times. What is the experimental probability of rolling a 4? Write your answer as a simplified fraction.
1/4
A bag has 10 balls. If the probability of selecting a yellow ball is
1/5
, how many yellow balls are there?
2
What is the term for probability based on actual results from an experiment?
Experimental probability
When playing Monopoly, what is the chance that you will roll a total of 12?
1/36
A die is rolled. What is the probability of getting a number less than 3? Write your answer as a simplified fraction.
1/3
A basketball player makes 18 out of 30 shots. What is their experimental probability of scoring? Write your answer as a fraction.
18/30 or 3/5
The probability of rain tomorrow is 0.3. What is the probability it does NOT rain?
0.7
If the probabilities of all possible outcomes were added together, the sum would be equal to 1 (or 100%). We say these events are _____________.
Complementary
A bag has 2 red, 4 blue, and 6 green balls. What is the probability of choosing a green ball? Write your answer as a decimal.
0.5
How many outcomes are in the sample space of rolling a standard die?
6
A spinner is spun 50 times. Red appears 20 times. What is the relative frequency of red? Write your answer as a percentage.
40%
A spinner has red, blue, and green sections. The probability of red is 0.2 and blue is 0.5. What is the probability of green?
0.3
If a situation has a probability of 1, what word could we use to describe the chance of that situation?
Certain (or similar word)
List all the possible outcomes when selecting a card from a standard deck and noting the suit.
Hearts, diamonds, spades and clubs.
On a test, a student guesses the answers to 20 multiple choice questions. Each question has options A, B, C and D. How many questions would you expect them to guess correct?
5
A die is rolled 60 times. How many times would you expect to roll a 2?
A die is rolled 120 times. How many times would you expect to roll a number more than 4?
40