How to find the probability of an outcome

Practice Questions

ACT Math › How to find the probability of an outcome

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1

When rolling a die, what is the probability you roll a number less than or equal to ? Give your answer as a reduced fraction.

2

A coin is flipped seven times. What is the probability of getting heads six or fewer times?

3

Presented with a deck of fifty-two cards (no jokers), what is the probability of drawing either a face card or a spade?

4

A coin is flipped four times. What is the probability of getting heads at least three times?

5

There are 20 balls in a box, 10 are green, 5 are blue, and 5 are red. One red and one green ball are then removed from the box.

What is the probability that the third ball removed from the box will be green?

6

A fair die is rolled three times. What are the odds that the die will come up a six on all three rolls?

7

What is the probability that Jim flips a fair coin 3 times and gets 3 heads?

8

Kaleah was born on the 17th day of the month. What is the probability that the next person she meets was born the 17th day of the month if they were born in August?

9

A coin is tossed five times. What is the probability of tails occuring at least once?

10

An auto insurer underwrites its 60 customers and classifies them in 3 mutually exclusive risk classes. 15 of the customers are in the high-risk class, 35 are in the moderate-risk class, and 10 are in the low-risk class. What is the probability that a randomly selected customer will be in the moderate- or high-risk class?

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