Worksheet Solutions: Probability | Mental Mathematics for Class 8 PDF Download

Q1: A bag has 8 blue marbles, 5 red marbles, and 7 green marbles. What is the probability, as a percent, of drawing a green marble?
Ans: 35%

Q2: What is the probability, as a ratio to all possibilities, of drawing a blue marble?
Ans: 2 : 5

Q3: If the probability of rain in Brandon is 40%, what is the probability that it won’t rain?
Ans: 60%

Q4: A coin is tossed and a six-sided die is rolled. What is the probability of tossing a heads and rolling a 4?
Ans: 1 out of 12

Q5: What is the probability of getting 2 true or false questions correct with random guesses?
Ans: 1 out of 4

Q6: What is the probability, as a reduced fraction, of drawing a red marble?
Ans: 14

Q7: Can the probability of something occurring ever be greater than 100%?
Ans: No

Q8: What is the probability of rolling a seven on a regular six-sided die?
Ans: 0%

Q9: What is the probability of rolling a 6 twice in a row on a six-sided die?
Ans: 1 out of 36

Q10: What is the probability of getting 2 true or false questions both wrong with random guesses?
Ans: 1 out of 4

Q11: Calculate: 64% of 25
Ans: 16

Q12: Calculate: 42% of 20
Ans: 8.4

Q13: Calculate: 41% of 50
Ans: 20.5

Q14: Calculate: 25% of 64
Ans: 16

Q15: Calculate: 20% of 42
Ans: 8.4

Q16: What is the probability of rolling an even number twice in a row on a six-sided die?
Ans: 1 out of 4

Q17: A multiple choice test has questions with options of a, b, c, or d. What is the probability of getting two questions correct with random guesses?
Ans: 1 out of 16

Q18: A baseball player has a 20% probability of hitting the ball. This player has 15 opportunities to hit. How many hits should be expected?
Ans: 3 hits

Q19: There is an 80% chance of rain in Winnipeg, a 10% chance of rain in Portage, and a 25% chance of rain in Thompson all on the same day. What is the probability of rain occurring in all three cities?
Ans: 2% chance of rain in the three cities

Q20: What is the probability of getting these same two questions wrong?
Ans: 9 out of 16