Probability using Fractions, Percents, and Decimals

You spin the spinner shown.  The spinner lands on yellow.

• 2/3

• 0.33

• 33%

• 1/3

• 67

There are 12 pieces of fruit in a bowl.   Five are lemons and the rest are limes.  You choose a piece of fruit without looking.  The piece of fruit is a lime.

• 7/12

• 0.58

• 50%

• 0.50

• 58%

Leona has 4 nickels, 6 pennies, 4 dimes, and 2 quarters in a change purse.  Leona lets her little sister Daisy pick a coin at random.  If Daisy is equally likely to pick each type of coin, what is the probability that her coin is worth more than five cents? Explain. 

• 3/8

• 38%

• 0.25

• 0.38

• 25%

You spin the spinner shown.  The spinner lands on blue or green. 

• 2/3

• 0.67

• 33%

• 0.33

• 67%

You pick one card at random from a standard deck of 52 playing cards. You pick a black card.

• 1/2

• 0.50

• 50%

• 25%

• 3/4

You choose a movie CD at random from a case containing 8 comedy CDs, 5 science fiction CDs, and 7 adventure CDs.  The CD is not a comedy. 

• 20%

• 0.60

• 60%

• 3/5

• 0.20

You roll a number cube.  You roll a number that is greater than 2 and less than 5.  

• 1/3

• 17%

• 33%

• .17

• 0.33

The theoretical probability of a given event is 9/13. Explain what each number represents. The 9 represent... and the 13 represents ...

• The 9 represents the ways the event can occur

• The 13 represents the number of equally likely outcomes

• The 9 represents the number of equally likely outcomes.

• The 13 represents the ways the event can occur.

How can you find the probability of a simple event if the total number of equally likely outcomes is 20?

• Add 20

• Subtract 20

• Multiply 20

• Divide 20

Bonus: A jar contains 8 red marbles, 10 blue ones, and 2 yellow.  One A jar contains 8 red marbles, 10 blue ones, and 2 yellow.  One marble is chosen at random.  The color is recorded in the table, and then it is returned to the jar.  This is repeated 40 times. Use the proportional reasoning to explain how you know that for each color, the theoretical and experimental probabilities are not the same.

What is the word that goes in the blank?

The number of trials is __________ the number of marbles in the jar.  If the probabilities for each color were the same,  the number of times that color was drawn would be ________ the number of marbles with that color in the jar.  

• Twice

• 3 times

• more likely

• less than