Probability Review

A store manager receives a delivery of 2 boxes of lightbulbs. Each box contains 25 lightbulbs. The store manager tests all the lightbulbs and finds that 2 of them are defective. Based on these results, what can the store manager predict about the next delivery of lightbulbs?

• A delivery of 3 boxes will contain 3 more defective lightbulbs than a delivery of 2 boxes.

• A delivery of 4 boxes will contain 2 more defective lightbulbs than a delivery of 2 boxes.

• A delivery of 5 boxes will contain 10 more defective lightbulbs than a delivery of 2 boxes.

• A delivery of 6 boxes will contain 3 more defective lightbulbs than a delivery of 2 boxes.

Tags

CCSS.5.OA.B.3

• There will be 30 chocolate chip cookies sold.

• There will be a total of 225 almond and oatmeal cookies sold.

• There will be 175 lemon cookies sold.

• There will be a total of 55 chocolate chip and lemon cookies sold.

• The likelihood of a package including a doctor is equal to the likelihood of a package including a lifeguard or a firefighter.

• The likelihood of a package including a soldier is less than the likelihood of a package including a firefighter or a lifeguard.

• The likelihood of a package including a soldier is twice the likelihood of a package including a firefighter.

• The likelihood of a package including a lifeguard is greater than the likelihood of a package including a soldier or a doctor.

Tags

CCSS.7.SP.C.6

• The golf ball is more likely to be green than all other colors combined.

• The golf ball is equally likely to be pink, white, orange, or green.

• The golf ball is 2 times as likely to be orange as it is to be pink.

• The golf ball is 7 times as likely to be green as it is to be white.

Tags

CCSS.7.SP.C.7A

Mark and Bobby are going to share a pizza. Mark will randomly choose the topping for his half, and Bobby will randomly choose the topping for his half. The topping choices are pepperoni, meatballs, sausage, onions, peppers, mushrooms, tomatoes, and olives.

What is the probability that Mark and Bobby will both choose mushrooms?

• $\frac{1}{8}$

• $\frac{1}{64}$

• $\frac{1}{16}$

• $\frac{1}{56}$

On Roberto’s shelf are:

6 mystery books

5 science books

4 history books

3 adventure books

Roberto will randomly choose 1 book to read. What is the probability that he will choose an adventure book?

• $\frac{1}{3}$

• $\frac{1}{18}$

• $\frac{1}{5}$

• $\frac{1}{6}$

Tags

CCSS.7.SP.C.7B

• $\frac{1}{25}$

• $\frac{2}{45}$

• $\frac{1}{2}$

• $\frac{2}{5}$

One letter was selected at random from the words "SAN ANTONIO." What is the probability that the selected letter was either an A or an N?

• 
  

  $\frac{3}{50}$
  

• $\frac{1}{2}$

• $\frac{2}{5}$

• $\frac{1}{15}$

Gabriel has these cans of soup in his kitchen cabinet.

2 cans of tomato soup

3 cans of chicken soup

2 cans of cheese soup

2 cans of potato soup

1 can of beef soup

Gabriel will randomly choose one can of soup. Then he will put it back and randomly choose another can of soup. What is the probability that he will choose a can of tomato soup and then a can of cheese soup?

• 
  

  $\frac{2}{5}$
  

• $\frac{2}{45}$

• $\frac{1}{25}$

• $\frac{1}{5}$

Eric is playing a video game. His character in the game must first choose between stairs that go up and stairs that go down. Next his character will have to choose whether to open a door on the left or a door on the right.

Which tree diagram shows all the possible outcomes of these two choices?

• 
• 
• 
• 

Tags

CCSS.7.SP.C.8B