Probability Quiz

A coin is flipped once. What is the probability of getting tails?

• 1/3

• 1/2

• 2/3

• 1/4

Answer explanation

When flipping a fair coin, there are two possible outcomes: heads or tails. Each outcome is equally likely, so the probability of getting tails is 1 out of 2, or 1/2.

A die is rolled. What is the probability of rolling a 4?

• 1/3

• 1/5

• 1/6

• 1/2

Answer explanation

A standard die has 6 faces, numbered 1 to 6. The probability of rolling any specific number, including 4, is 1 out of 6 possible outcomes. Therefore, the probability of rolling a 4 is 1/6.

A spinner has 4 equal sections: A, B, C and D. What is the probability of landing on A or B?

• 1/2

• 2/4

• 3/4

• 1/4

Answer explanation

The spinner has 4 equal sections: A, B, C, and D. Landing on A or B means there are 2 favorable outcomes (A and B) out of 4 total outcomes. Thus, the probability is 2/4, which simplifies to 1/2.

A coin is flipped and a dice is rolled. What is the probability of getting heads and an even number?

• 1/3

• 1/2

• 1/4

• 1/6

Answer explanation

The probability of getting heads from the coin is 1/2. The even numbers on a die (2, 4, 6) are 3 out of 6, giving a probability of 1/2. Thus, the combined probability is (1/2) * (1/2) = 1/4.

A box contains 3 blue pens, 2 red pens, and 5 black pens. One pen is picked at random. What is the probability of getting a red or blue pen?

• 4/10

• 5/10

• 6/10

• 7/10

Answer explanation

The box contains 3 blue and 2 red pens, totaling 5 pens. The total number of pens is 10. The probability of picking a red or blue pen is 5/10.

The probability of getting a 6 both times when you roll a die twice is (a)  

• 1/6
• 1/12
• 1/36
• 1/3

Answer explanation

The probability of rolling a 6 on a die is 1/6. Since the rolls are independent, multiply the probabilities: (1/6) * (1/6) = 1/36. Thus, the probability of getting a 6 both times is 1/36.

A bag has 10 sweets: 4 cola, 3 lemon, and 3 cherry. The probability of not picking a cola sweet is (a)   .

• 4/10
• 3/10
• 6/10
• 7/10

Answer explanation

To find the probability of not picking a cola sweet, first calculate the total sweets (10). The non-cola sweets are 3 lemon + 3 cherry = 6. Thus, the probability is 6/10, which simplifies to 3/5.

A coin is flipped twice. What is the probability of getting at least one head?

• 1/4

• 3/4

• 1/2

• 2/3

Answer explanation

When flipping a coin twice, the possible outcomes are HH, HT, TH, TT. Out of these, 3 outcomes (HH, HT, TH) have at least one head. Thus, the probability is 3 out of 4, or 3/4.

What is the probability of rolling an odd number on a standard die?

• 1/3

• 1/2

• 1/6

• 2/3