Basic Probability (one thing)
When flipping a coin 2 times in a row and then rolling one die, how many possible outcomes are there in the sample space?
2 x 2 x 6 = 24
9/100 = 0.09 = 9%
If 2 coins are tossed what is the probability that you land 2 tails?
1/4
You are drawing two cards from a standard deck. Find the probability that you draw a king first and then you draw a face card second.
4/52 x 11/51 = 11/663
In a bag of marbles, there are 7 blue marbles, 5 green marbles, 6 yellow marbles, and 3 red marbles. When you randomly pick up one marble, what is the probability of picking up a blue or yellow marble?
13/21
A bag of marbles has 3 red, 4 blue and 5 green. The probability of getting a red or green.
8/12 = 4/6 = 2/3
A 6-sided die is rolled, what is the probability of rolling a 6 or 1?
2/6 = 1/3
You are drawing two cards from a standard deck and you are putting the card back in the deck after each draw. Find the probability that you draw a red card first and then draw a 7.
26/52 x 4/52 = 1/26
When drawing one card from a deck of cards, what is the probability of drawing a king or a red card?
4/52 + 26/52 - 2/52 = 28/52 = 7/13
A twenty-sided dice is rolled. The probability of getting an even number.
10/20 = 1/2
The probability that a basketball player scores from the free-throw line is 0.3. What is the probability that the player scores from both free-throws?
0.3 x 0.3 = 0.09
You are rolling a die and flipping a coin in sequence. Find the probability that you first flip heads, then roll a 4, and then lastly roll an even number.
1/2 x 1/6 x 3/6 = 1/24
When rolling two dice together, what is the probability of rolling a sum of 4?
3/36 = 1/12
A team of 15 basketball players have to randomly choose a team captain. The probability that the captain is "Greg".
1/15
A die is rolled twice, what is the probability that you roll at least 1 six?
P(only 1 six) = 1/6 x 5/6 + 5/6 x 1/6 = 10/36
P(2 sixes) = 1/6 x 1/6 = 1/36
P(at least 1 six) = 11/36
The likelihood of it raining on a random Fall day is 27%. Find the probability that it rains three days in a row.
.27 x .27 x .27 = 0.0197
(about a 2% chance)
When drawing one card from a deck of cards, what is the probability of drawing an even numbered card?
20/52 = 5/13
12/52 = 3/13
Bella buys 5 tickets in a raffle. 100 tickets are sold and there are 2 prizes. What is the probability that Bella wins both prizes?
P(first prize AND second prize) = 5/100 x 4/99
= 1/495
There is a cooler full of drinks. In this cooler, there are 10 orange flavored drinks, 8 grape flavored drinks, and 12 lemon flavored drinks. Find the probability that the next 3 people who grab a drink all grab grape flavored drinks.
8/30 x 7/29 x 6/28 = 2/145
(or 0.01379 so about a 1% chance)