Finding Simple Probability

Finding Simple Probability

By Susan Kahler

​Example: The spinner to the left is spun once. What is the probability of it landing on an even number? Write as a fraction, decimal, and percent.

P(even) = 6/12=1/2=0.5=50%​

Multiple Choice

The spinner shown is spun once. What is the probability of getting a number less than 10?

Write the answer as a fraction, percent, or decimal.

• 3/4

  0.75

  75%

• 1/4

  0.25

  25%

• 1/2

  0.50

  50%

• 1/3

  0.33

  33%

• 1/5

  0.20

  20%

Many times the previous question is represented this way.

P(no more than 10)

This P( ) stands for find the probability of what is written inside the ( ) happening. ​

Multiple Choice

P( even or a multiple of 3)

This would be read as, what is the probability of landing on an even number or a multiple of 3?

• 2/3

  0.67

  67%

• 1/3

  0.33

  33%

• 2/3

  0.75

  75%

• 4/5

  0.80

  80%

Multiple Choice

P( less than 10 and odd)

• 5/12

  0.60

  60%

• 1/2

  0.50

  50%

• 5/12

  0.42

  42%

• 7/12

  0.58

  58%

Multiple Choice

What is the probability of the ball landing in an odd numbered jar that is unshaded?

• P (odd and unshaded) =

  5/18

  0.27

  27%

• P (odd and unshaded) =

  1/3

  0.33

  33%

• P (odd and unshaded) =

  2/9

  0.22

  22%

• P (odd and unshaded) =

  1/2

  0.5

  50%

Multiple Choice

P ( shaded and at least 18)

be careful of that word and when they are witten this way. If you have and it means that both conditions must be satisfied.)

• 7/36

  0.19

  19%

• 5/36

  0.14

  14%

• 1/2

  0.50

  50%

• 1/6

  0.17

  17%

Fill in the Blanks

Fill in the Blanks