DAT Quantitative Reasoning: Probability 2

Question 1

A fair six-sided die is rolled once. What is the probability of rolling a number greater than 4?

Accepted Answer

1/3

Answer

Outcomes greater than 4 are 5 and 6, so 2/6 = 1/3.

Question 2

A bag has 4 red and 6 blue marbles. What is the probability of drawing a red marble?

Accepted Answer

2/5

Answer

There are 4 red out of 10 total, so 4/10 = 2/5.

Question 3

What is the probability of flipping a fair coin twice and getting two heads?

Accepted Answer

1/4

Answer

Each flip is 1/2, so 1/2 × 1/2 = 1/4.

Question 4

A standard deck has 52 cards. What is the probability of drawing a king?

Accepted Answer

1/13

Answer

There are 4 kings, so 4/52 = 1/13.

Question 5

If the probability of an event is 0.35, what is the probability it does NOT occur?

Accepted Answer

0.65

Answer

The complement is 1 − 0.35 = 0.65.

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