Mastering Probability Concepts

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

• 1/12

• 1/4

• 1/6

• 1/8

If a coin is flipped twice, what is the probability of getting at least one head?

• 0.75

• 0.50

• 1.00

• 0.25

A bag contains 3 red balls and 2 blue balls. What is the probability of drawing a red ball first and a blue ball second without replacement?

• 3/10

• 1/5

• 2/5

• 4/10

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

• 0.3

• 0.2

• 0.4

• 0.1

A factory produces light bulbs, and 90% pass the quality test. If 5 bulbs are tested, what is the expected number of bulbs that pass?

• 4.0

• 4.5

• 5.0

• 3.0

What is the probability of drawing a heart from a standard deck of cards?

• 1/3

• 2/5

• 1/4

• 1/2

If the probability of event A occurring is 0.3, what is the probability of event A not occurring?

• 0.5

• 0.1

• 0.7

• 0.9

A student has a 70% chance of passing a test. If they take the test twice, what is the probability they pass at least once?

• 0.5

• 0.91

• 0.85

• 0.75

In a normal distribution, what percentage of data falls within one standard deviation of the mean?

• 68%

• 34%

• 95%

• 50%

If a die is rolled, what is the expected value of the outcome?

• 3.5

• 2.0

• 6.0

• 4.0