Probability

What is the probability of getting a head when tossing a fair coin once?
a) 0
b) 1
c) 1/2
d) 1/3
Answer: c

If a die is rolled once, what is the probability of getting an even number?
a) 1/2
b) 1/3
c) 2/3
d) 1/6
Answer: a

In probability, the sum of all possible event probabilities in an experiment is always:
a) 0
b) 1
c) 2
d) 100
Answer: b

The probability of an impossible event is:
a) 1
b) 0
c) 1/2
d) 2
Answer: b

If a bag contains 3 red balls and 2 blue balls, what is the probability of drawing a red ball?
a) 3/5
b) 2/5
c) 1/5
d) 1/3
Answer: a

What is the probability of rolling a number less than 5 on a standard die?
a) 2/3
b) 1/2
c) 1/3
d) 5/6
Answer: a

A fair die has how many total possible outcomes?
a) 5
b) 6
c) 7
d) 10
Answer: b

If the probability of an event happening is P(E), then the probability of it not happening is:
a) 1 – P(E)
b) P(E) – 1
c) 2P(E)
d) P(E) / 2
Answer: a

What is the probability of drawing a king from a standard deck of 52 playing cards?
a) 1/13
b) 1/4
c) 1/52
d) 1/26
Answer: a

What is the probability of getting a number greater than 2 when rolling a die?
a) 2/3
b) 1/2
c) 5/6
d) 1/3
Answer: a

Which of the following cannot be a probability value?
a) 1
b) 0.5
c) -0.2
d) 3/4
Answer: c

In a well-shuffled deck of 52 cards, what is the probability of drawing an ace?
a) 1/26
b) 1/13
c) 1/52
d) 4/52
Answer: b

What is the probability of selecting a black card from a deck of playing cards?
a) 1/4
b) 1/2
c) 1/3
d) 3/4
Answer: b

If a bag contains 4 red balls and 6 green balls, what is the probability of drawing a green ball?
a) 3/5
b) 2/5
c) 1/5
d) 4/10
Answer: a

The probability of rolling an odd number on a die is:
a) 1/2
b) 1/3
c) 1/6
d) 5/6
Answer: a

A die is rolled twice. What is the probability of getting two even numbers?
a) 1/4
b) 1/3
c) 1/2
d) 1/9
Answer: a

What is the probability of drawing a face card from a deck of 52 playing cards?
a) 3/13
b) 1/4
c) 3/26
d) 1/13
Answer: a

If P(A) = 0.4 and P(B) = 0.6, and A and B are complementary events, what is P(A ∪ B)?
a) 1
b) 0.6
c) 0.4
d) 0
Answer: a

A bag contains 4 red balls, 3 blue balls, and 2 green balls. What is the probability of drawing a red or blue ball?
a) 4/9
b) 7/9
c) 5/9
d) 3/9
Answer: b

A fair coin is tossed three times. What is the probability of getting at least one head?
a) 7/8
b) 3/8
c) 1/2
d) 1/8
Answer: a

What is the probability of getting at least one tail when flipping two coins?
a) 3/4
b) 1/2
c) 1/4
d) 2/4
Answer: a

If a probability of an event is P(E) = 0.7, what is the probability of its complement?
a) 0.3
b) 0.7
c) 1
d) 1.7
Answer: a

A bag contains 5 blue and 10 yellow marbles. What is the probability of selecting a yellow marble?
a) 2/3
b) 1/2
c) 1/3
d) 3/5
Answer: a

The probability of a certain event occurring is:
a) 0
b) 1
c) 0.5
d) None of these
Answer: b

What is the probability of rolling a sum of 8 when rolling two dice?
a) 5/36
b) 6/36
c) 7/36
d) 4/36
Answer: a

If a fair coin is tossed twice, what is the probability of getting at least one head?
a) 1/2
b) 3/4
c) 1/4
d) 2/3
Answer: b

The probability of an event that is certain to happen is:
a) 0
b) 1
c) 1/2
d) Cannot be determined
Answer: b

A bag contains 5 red, 3 blue, and 2 green balls. What is the probability of drawing a red ball?
a) 1/2
b) 3/10
c) 1/5
d) 5/10
Answer: a

If two dice are rolled, what is the probability of getting a sum of 7?
a) 1/6
b) 1/12
c) 1/3
d) 1/36
Answer: a

The probability of drawing a king from a well-shuffled deck of 52 playing cards is:
a) 1/13
b) 1/26
c) 1/52
d) 1/4
Answer: a

If a number is randomly chosen from 1 to 100, what is the probability that it is a multiple of 5?
a) 1/5
b) 1/10
c) 1/20
d) 1/25
Answer: a

A bag contains 4 white, 3 black, and 5 red balls. If one ball is drawn at random, what is the probability that it is neither white nor black?
a) 3/4
b) 5/12
c) 1/2
d) 7/12
Answer: b

If a coin is tossed three times, what is the probability of getting exactly two heads?
a) 1/8
b) 1/4
c) 3/8
d) 3/4
Answer: c

In a class of 40 students, 10 like cricket, 15 like football, and 5 like both. If a student is selected at random, what is the probability that they like either cricket or football?
a) 1/2
b) 3/4
c) 1/4
d) 2/5
Answer: b

A deck of playing cards has 52 cards. What is the probability of drawing a red face card?
a) 1/13
b) 3/26
c) 2/13
d) 1/26
Answer: b

The probability of not getting a 6 when rolling a fair die is:
a) 1/6
b) 5/6
c) 2/3
d) 1/2
Answer: b

A letter is chosen randomly from the word “PROBABILITY.” What is the probability of selecting the letter ‘B’?
a) 1/11
b) 2/11
c) 3/11
d) 4/11
Answer: b

If two fair dice are rolled, what is the probability that the product of the numbers rolled is even?
a) 3/4
b) 1/2
c) 2/3
d) 1/4
Answer: a

A lottery has 1000 tickets, and one ticket is drawn at random. If a person holds 20 tickets, what is the probability that they win?
a) 1/50
b) 1/25
c) 1/100
d) 1/20
Answer: a

A bag contains 6 white, 4 black, and 5 green balls. A ball is drawn at random. What is the probability that it is black or green?
a) 9/15
b) 4/15
c) 3/5
d) 2/5
Answer: a

A box contains 15 bulbs, out of which 5 are defective. If two bulbs are drawn at random, what is the probability that both are non-defective?
a) 10/21
b) 2/3
c) 5/21
d) 3/7
Answer: a

A bag contains 5 red balls and 7 green balls. Two balls are drawn at random. What is the probability that both are red?
a) 1/3
b) 5/22
c) 2/5
d) 3/10
Answer: b

If a die is rolled twice, what is the probability that the sum of the numbers is greater than 9?
a) 1/6
b) 1/9
c) 5/18
d) 1/4
Answer: c

A card is drawn from a deck. What is the probability that it is neither a king nor a queen?
a) 11/13
b) 9/13
c) 10/13
d) 12/13
Answer: d

The probability that a randomly chosen number between 1 and 50 is prime is:
a) 9/25
b) 11/25
c) 3/10
d) 2/5
Answer: b

Two dice are rolled together. What is the probability of getting at least one 5?
a) 11/36
b) 1/6
c) 5/12
d) 7/36
Answer: a

A team of 3 students is selected from a group of 8 boys and 7 girls. What is the probability that all selected students are boys?
a) 14/65
b) 10/39
c) 2/5
d) 16/35
Answer: b

If the probability of an event happening is 0.4, what is the probability of its complement?
a) 0.4
b) 0.6
c) 1.0
d) 0.5
Answer: b

The probability of randomly selecting a vowel from the word “PROBABILITY” is:
a) 4/11
b) 5/11
c) 3/11
d) 2/11
Answer: a

If a bag contains 8 blue balls, 5 red balls, and 7 green balls, what is the probability of drawing either a blue or green ball?
a) 1/3
b) 7/10
c) 4/5
d) 2/5
Answer: b