Basic Probability
(Grade 5)
(Grade 5)
What is the probability of rolling a 3 on a regular six-sided die?
1/6
If you flip a coin, is it more likely to land on heads or tails?
Both are equally likely.
What does "impossible" mean when talking about probability?
The event is not going to happen.
What is the probability of raining tomorrow if the forecast predicts a 70% chance of rain?
70% or 0.7
What is the mean of these numbers: 4, 6, 8, 10?
To find the mean:
Add all the numbers together: 4 + 6 + 8 + 10 = 28
Then divide by the number of values: 28 ÷ 4 = 7
If you have 5 red marbles and 3 blue marbles in a bag, what is the probability of drawing a blue marble?
3/8
Is it more likely to roll an even or odd number on a 6-sided die?
Both are equally likely.
What does "probability" mean?
The chance or likelihood of an event happening.
If 3 out of 5 students in the class wear glasses, what is the probability that a student picked at random wears glasses?
3/5
What is the median of this set of numbers: 11,5, 3, 7, 9?
(It's the middle number in the ordered list: 3, 5, 7, 9, 11)
It's 7!
What is the probability of flipping heads on a fair coin?
1/2
If you draw a marble from a bag with 1 red marble and 9 white marbles, is it more likely to draw a red or white marble?
White (9/10 probability).
What is an "outcome" in probability?
The result of a single trial or event (e.g., flipping heads on a coin).
What is the probability of getting a red car in a parking lot with 8 blue cars, 3 red cars, and 2 green cars?
3/13
What is the mode of these numbers: 2, 4, 6, 4, 8, 4, 10?
The mode is the number that appears the most.
Answer: 4 (It appears 3 times)
If there are 4 yellow balls, 2 blue balls, and 6 red balls in a bag, what is the probability of drawing a red ball?
6/12 or 1/2
If you roll a 12-sided die, is it more likely to roll a number above 10 or below 5?
Below 5 (there are more numbers under 5).
What is the "probability of a certain event"?
1 (It is guaranteed to happen).
What is the probability of getting a traffic light that’s green, if there are 2 red lights, 3 yellow lights, and 1 green light?
1/6
What is the mean of these numbers: 10, 12, 14, 16?
To find the mean:
Add all the numbers together: 10 + 12 + 14 + 16 = 52
Then divide by the number of values: 52 ÷ 4 = 13
What is the probability of drawing a number greater than 5 on a spinner with numbers 1–10?
5/10 or 1/2
In a deck of 52 playing cards, is it more likely to draw a face card (Jack, Queen, King) or a numbered card?
Numbered card (40 out of 52 cards are numbered).
What does "theoretical probability" refer to?
The probability based on possible outcomes, without conducting the experiment (e.g., 1/6 for a fair die).
What is the probability of getting a 10-minute wait at a restaurant if the wait times are 5, 10, and 15 minutes, and they happen equally often?
1/3
What is the median of this set of numbers: 6, 2, 9, 5, 1?
First, put the numbers in order: 1, 2, 5, 6, 9
The median is the middle number.
Answer: 5