Probability of Simple, Independent, & Dependent Events

1/625

20% of Americans do not have a cellphone. If you pick four people at random, what is that probability that all four do not have a cellphone?

75%

A bag contains 3 red balloons, 2 purple balloons, 4 yellow balloons, 2 pink balloons, and 1 brown balloon. Without looking, Melissa pulls out a balloon. What is the probability Melissa pulls out a yellow, pink, or purple balloon?

1/105

A birthday party has a grab bag for each of the guests. There are 8 bags filled with candy, 5 containing CDs, and 2 grand prize bags with gift certificates. The bags are identically wrapped and shuffled. Joe is first to choose a bag, and Devon is second. What is the probability that Joe and Devon will both choose grand prize bags?

unlikely

A bookshelf contains 6 fiction books, 2 non-fiction books, and 1 picture book. A book is chosen at random. What is the likelihood of choosing a picture book?

0.25

A box contains 6 red marbles, 4 green marbles, 4 blue marbles, and 2 yellow marbles. If one marble is chosen at random, what is the probability that it will be green?

1/8

A coin is flipped three times. What is the probability of getting all heads?

7/8

A coin is flipped three times. What is the probability of getting at least 1 head?

3/8

A coin is flipped three times. What is the probability of getting two heads?

2/21

A cooler contains 5 cans of diet cola, 6 cans of regular cola, and 4 cans of grape soda. Janice randomly selects a can from the cooler. Then David randomly selects a can from the cooler. What is the probability that both Janice and David will select diet cola?

19/30

A jar is filled with pennies, nickels, and dimes. The probability of picking a penny is 1/5, and the probability of picking a dime is 1/6 . What is the probability of picking a nickel?

1/9

A school cafeteria has 3 containers of white milk, 5 containers of chocolate milk and 2 containers of apple juice left. Iliana is first in line and Vishal is second. If the drinks are given out randomly, what is the probability that Iliana will get chocolate milk and Vishal will get apple juice?

1/4

A set of eight cards is labeled with the numbers 1 through 8. A card is chosen, replaced, and a second card is chosen. What is the probability that both cards will be even numbers?

1/12

A spinner has red, green, blue, and orange sections. The probability of landing on red is 3/4 , on green is 1/12 , on blue is 1/12. What is the probability of landing on an orange section?

1/3

Ana will spin the spinner below. What is the probability that Ana's spin will land on yellow?

5/14

Andrew has $2.00 in quarters in his pocket, including three state quarters. He takes 2 quarters out of his pocket. What is the probability that they are not state quarters?

1/90

Bob has a set of 10 colored markers in a backpack. One is yellow and one is blue. What is the probability Bob will reach into the backpack without looking and grab the yellow marker and then reach in a second time and grab the blue marker?

independent events

Cynthia flips a coin and it lands heads up. She flips it again and it lands tails up. Are these events independent or dependent?

3/20

Each day Mr. Grover randomly chooses 2 students from his class to serve as helpers. If there are 15 boys and 10 girls in the class, what is the probability that the two students chosen will be female?

dependent events

Each student in Mr. Coleman's science class uses one of the 20 lab stations for experiments. Mr. Coleman lets students choose their own lab station. Gloria is the first in the class to choose a station for her work. José then chooses a lab station. Are these events independent or dependent?

impossible

Eight cards are marked 3, 4, 5, 6, 7, 8, 9, and 10 such that each card has exactly one of these numbers. A card is picked without looking. What is the likelihood that the card is less than 3?

1/7

Franco has 7 quarters in his pocket. Of these, 3 depict the state of Delaware, 2 depict Georgia, 1 depicts Connecticut and 1 depicts Pennsylvania. Franco removes 1 quarter from his pocket and then removes a second quarter without replacing the first. What is the probability that both will be Delaware quarters?

1/33

Jamie has three raffle tickets. One hundred tickets were sold. Her name was not drawn for the first prize. What is the probability that her name will be drawn for the second prize?

1/6

Mr. Martinez has 4 blue shirts, 6 white shirts, and 2 gray shirts. He will randomly choose a shirt to wear. What is the probability the shirt Mr. Martinez chooses will be gray?

9/21

Mr. Tindel will randomly choose a student from his class as the student council representative. There are 12 girls and 9 boys in his class. What is the probability Mr. Tindel will choose a boy?

1/1728

Ms. Danch is picking cards from a deck of 12 cards. What is the probability that she picks 3 aces in a row if she replaces the cards?

1/1320

Ms. Planz is picking cards from a deck of 12 cards. What is the probability that she picks three aces in a row if she does not replace the cards?

6/35

Ms. Stanley has a bag of 15 marbles. 3 are blue, 6 are red, and 6 are yellow. What is the probability that she picks a yellow and then a red if she does not replace the marbles?

3/91

Ms. Stanley has a bag of 15 marbles. 3 are blue, 6 are red, and 6 are yellow. What is the probability that she picks two yellows and a blue if she does not replace the marbles?

57%

Of the water lilies in the pond, 43% are yellow. The others are white. A frog randomly jumps onto a lily. What is the probability that the frog jumped on a white lily?

1/2

Terry placed 6 number tiles labeled 4, 7, 10, 11, 14, and 21 in a box. He will pick one of the number tiles from the box without looking. What is the probability Terry will pick a tile labeled with an odd number?

likely

The numbers 4, 64, 22, 7, 34, and 9 are written on pieces of paper and placed in a bag. A piece of paper is chosen randomly out of the bag. How likely is it that the number on the paper will be an even number?

13/25

There is a 65% chance of rain today. When it rains, there is a 80% chance of Ms. Raines wearing rain boots to school. What is the probability that it rains and Ms. Raines wears rain boots.

16/25

Weather forecasters have accurately predicted rain in one community 4/5 of the time. What is the probability that they will accurately predict rain two days in a row?

1/36

You roll a 1-6 number cube twice. What is the probability that you roll a 3 on the first roll and a 6 on the second roll?