If two events are mutually exclusive, what can you say about their probabilities?

A) The probabilities are equal.

B) The probabilities are different.

C) The probabilities are multiplied.

D) The probabilities are added.

In a class, 70% of the students wear glasses. If a student is chosen at random, what is the probability that they do not wear glasses?

A) 0.3

B) 0.7

C) 0.4

D) 0.6

In a bag, there are 4 red balls and 5 blue balls. If two balls are drawn at random without replacement, what is the probability of getting a red ball and then a blue ball?

A) 4/45

B) 4/9

C) 5/18

D) 2/9

In a deck of 52 playing cards, what is the probability of drawing a spade?

A) 1/4

B) 13/52

C) 4/13

D) 26/52

A card is drawn from a well-shuffled deck and not replaced. Then a second card is drawn. What is the probability of getting a heart and then a spade?

A) 1/52

B) 1/26

C) 1/104

D) 1/13

In a race, the probability of John winning is 1/5 and the probability of Mark winning is 3/10. What is the probability that either John or Mark wins the race?

A) 1/15

B) 7/10

C) 1/2

D) 3/5

In a class, 60% of the students like chocolate and 40% like vanilla. If a student is chosen at random, what is the probability that they like both chocolate and vanilla?

A) 24%

B) 16%

C) 40%

D) 60%

A bag contains 4 red balls and 6 blue balls. If one ball is drawn at random, what is the probability of drawing a red ball?

A) 4/10

B) 6/10

C) 1/4

D) 3/5

The probability distribution of a random variable gives:

A) The possible values of the random variable.

B) The probabilities of the possible values.

C) The mean of the random variable.

D) The standard deviation of the random variable.

In a bag, there are 6 red balls and 4 blue balls. If two balls are drawn at random without replacement, what is the probability of getting two red balls?

A) 3/8

B) 1/3

C) 5/12

D) 1/4