Probability Unit Test Review

Each of the letters in MATHEMATICS are on separate cards, face down on a table.  If you pick a card at random, and then another card without replacement what is the probability that both card will be a vowel? 

• 4/11
• 16/121
• 7/21
• 6/55

A magician is doing a card trick using a standard deck of cards. What is the probability that he will pull a jack, followed by a queen? Assume he does NOT put the jack back. 
(Hint: there are 4 jacks and 4 queens in the deck of 52 total cards)

• 1/13
• 4/663
• 4/13
• 1/104

A bag contains ten black bows, twenty white bows, and 5 grey bows. If Ms. Sedlock picks one without looking, what is the probability she chooses a black, white, and grey bow? Assume she puts the bow back each time. 

• 8/343
• 35/100
• 4/257
• 3/49

Mrs. Mullins is using a random number generator to call students. It uses the numbers 1-30. What is the probability that it will pick the number 8 two times in a row? 

• 8/100
• 1/15
• 1/900
• 1/8

A bag contains 5 blue marbles, 4 red marbles, and 3 orange marbles. Mr. Bailey picks one without looking, replaces it, and picks another one. What is the probability that he picks two that are not orange? 

• 9/16
• 3/4
• 9/144
• 5/16

You are thinking of a number between -10 and 10. What is the probability that two people choosing a number at random, will both choose a positive number? (Hint: The number zero counts in the total, so there are 21 total numbers here). 

• 1/10
• 1/4
• 1/2
• 100/441

Ms. Mullins is playing cards with her friend with a standard deck of 52 cards. She needs to draw an Ace. What is the probability that she does NOT get the ace? (Hint: There are 4 aces in a deck)

• 1/4
• 1/13
• 12/13
• 48/52

Tags

CCSS.7.SP.C.5

Mr. Enstrom flipped a coin onto a black and red checkerboard. What is the probability that it will land heads up on a black square? 

• 1/2
• 1/4
• 1/8
• 1/16

The probability of getting a stuffed Pikachu from a claw machine is 1/5. The probability of getting a Pikachu from the claw machine next to it is 1/4. If you knew you definitely would get a stuffed animal from each claw machine, what is the probability that both are NOT a Pikachu?

• 1/20
• 19/20
• 2/5
• 3/5

Of 150 random customers, 52 ordered chocolate, 78 ordered vanilla, and the rest ordered strawberry. Based upon the results, how many of the next 75 customers would you expect to order strawberry?

• 10
• 20
• 40
• 65