Probability Practice STAAR Review

A math teacher has a bag of marbles.  The color and number of marbles are shown in the table below. 

                                                     

The teacher reaches into the bag and selects one marble at random.  Based on the information in the table, which of the following statements is true?

• The marble is twice as likely to be red as blue.

• The marble is more likely to be yellow than red.

• The marble is less likely to be black than orange.

A student spins two spinners at the same time.

                    

Which of the following statements is true?

• The probability of spinning an odd number on the first spinner is less than the probability of spinning an odd number on the second spinner.

• The probability of spinning an even number on the first spinner is more than the probability of spinning an even number on the second spinner.

• The probability of spinning an odd number on the first spinner is the same as the probability of spinning an even number on the second spinner.

• The probability of spinning an even number on the first spinner is more than the probability of spinning an odd number on the second spinner.

Mildred has a bag of coins.  The bag contains 7 quarters, 6 dimes, and 2 nickels.  She will randomly select 2 coins from the bag one at a time without replacement.  What is the probability that Mildred will select a dime first and then a quarter?

• 1/5

• 14/75

• 1/42

• 13/15

Mildred has a bag of coins.  The bag contains the following coins.

• 7 quarters

• 6 dimes

• 2 nickels 

 She will randomly select 2 coins from the bag one at a time with replacement.  What is the probability that Mildred will select a dime first and then a quarter?

• 1/5

• 14/75

• 1/42

• 13/15

Two bags each contain black and white marbles, as shown below.

                                             

If Karl draws one marble from each bag, what is the probability that they will both be black?

• 3/7

• 1/6

• 11/12

• 3

Each spinner shown below is divided into equally-sized sections.

                                                             

 Both spinners are spun at the same time.  What is the probability of spinning (Red, Even)?

• 1/2

• 1/4

• 1

• 3/4

​ Nerissa has 5 pink bows, 1 blue bow, and 4 purple bows in a box. She will randomly choose 1 bow from the box. 

What is the probability Nerissa will choose a purple bow?​ (a)  

• 2/5
• 1/2
• 1/10
• 3/5

A number cube with faces labeled from 1 to 6 was rolled 20 times. Each time the number cube was rolled, the number showing on the top face was recorded. The table shows the results. 

                                                           

Based on these results, what is the experimental probability that the next time the number cube is rolled it will land with 5 or 6 showing on the top face? ​ (a)  

• 2/5
• 3/20
• 1/3
• 3/5

If the probability of an event occurring is 0.4, what is the probability of the event NOT occurring?​ (a)  

• 0.6
• 0.4
• 0.5
• 0.1

​

 A bag contains colored tiles:

• 3 tiles are red

• 6 tiles are green

• 3 tiles are blue

A tile will be randomly selected from the bag. What is the probability in decimal form that the tile selected will be green?​ (a)  

​

• 0.3
• 0.5
• 0.1
• 0.6