Probability of Simple Events

Probability of Simple Events

Ph-USA Guru

At the end of the lesson, students will:

• be able to find the probability of a simple event.

• be able to understand the distinction between simple events and compound events.

  
  

Probability of Simple Events Vocabulary

• Outcome – one possible result of a probability.

• Sample Space – the list of possible outcomes for a probability event.

• Random – outcomes that occur at random if each outcome is equally likely to occur.

• Simple Event – a specific outcome or type of outcome. 

• Complementary Events – the events of one outcome happening and that outcomes not happening are complimentary; the sum of the probabilities of complementary events is 1.

Real World Example:

• Best Buy is having an IPOD giveaway. They put all the IPOD Shuffles in a bag.

• Customers may choose an IPOD without looking at the color. Inside the bag are 4 red, 7 green, 6 pink, 2 black, 4 blue, and 5 purple IPODS.  

• If Tracy chooses one IPOD at random, what is the probability she will choose an green IPOD?

Real World Example:

• If Tracy chooses one IPOD at random, what is the probability she will choose an orange IPODS?

• How many orange IPODs are there?

• What is the total number of IPODS?

• P(orange) = 4/20 = 2/10 = 1/5 or 20%

  
  

What is a PROBABILITY?

• Probability is the chance that some event will happen.

• It is the ratio of the number of ways a certain event can occur to the number of possible outcomes.

Poll

Do you have any question(s)?

• If yes, please type your question in the chat box or unmute yourself.

Multiple Choice

When you flip a coin, what is the probability of flipping a tail?

• 1/2

• head/tail

• 25%

• 75%

Key Concepts:

• Probability is the chance that some event will happen.

• It is the ratio of the number of ways a certain even can occur to the total number of possible outcomes

Poll

Multiple Choice

There are 52 cards in a deck of cards. Two colors: red and black. 4 suits: spades, clubs, hearts, and diamonds. Each suit has a 2-10, jack, queen, king, and ace (no jokers). What is the probability of drawing a card with a number on it?

• 9/52

• 1/2

• 9/13

• 3/4

Multiple Select

What is the probability of spinning a 2 on the spinner?

• 1/2

• 1/3

• 1/8

• 1/4

Multiple Choice

There are 15 girls and 15 boys in 8th period. If Terry randomly selects a member of 8th period, what is the probability that she will select a boy?

• 15/15

• 1/2

• 15/40

• 8/15

Multiple Choice

What is the probability that you choose blue? *simplify your fraction*

5 green

6 yellow

8 blue

7 brown

• 8/26

• 4/13

• 8/25

• 1/3

Multiple Choice

A bag contains 5 quarters, 2 dimes, and 4 pennies. What is the probability of picking a quarter?

• 5/11

• 5/6

• 1/3

• 5

Classwork:

•  Go to google classroom and click the link.