Mastering Probability Concepts

What is the probability of rolling a sum of 7 with two dice?

• 1/12

• 1/8

• 1/4

• 1/6

If a coin is flipped three times, what is the probability of getting exactly two heads?

• 0.25

• 0.375

• 0.5

• 0.625

A bag contains 3 red, 2 blue, and 5 green marbles. What is the probability of drawing a blue marble?

• 1/3

• 1/4

• 1/5

• 2/5

If two events A and B are independent, and P(A) = 0.4 and P(B) = 0.5, what is P(A and B)?

• 0.1

• 0.6

• 0.3

• 0.2

A card is drawn from a standard deck of 52 cards. What is the probability that it is a heart?

• 1/4

• 1/2

• 2/5

• 1/3

In a class of 30 students, 18 are girls. If a student is chosen at random, what is the probability that the student is a boy?

• 1/3

• 2/5

• 1/2

• 3/5

If the probability of rain tomorrow is 0.3, what is the probability that it will not rain?

• 0.7

• 0.5

• 0.1

• 0.9

A factory produces 90% of its products without defects. If 5 products are selected at random, what is the probability that all 5 are defect-free?

• 0.59049

• 0.25

• 0.75

• 0.45

If you roll a die, what is the probability of rolling a number greater than 4?

• 1/4

• 2/3

• 1/2

• 1/3

In a lottery, the odds of winning are 1 in 1000. What is the probability of winning?

• 0.01

• 0.001

• 0.0001

• 0.1