Probability

Probability

Review

Probability is the chance of an event happening.

We have learned how to measure probability using two ways:

• The certainty scale

• Fractions

The certainty scale measures probability using 4 terms

• IMPOSSIBLE - NEVER GOING TO HAPPEN

• UNLIKELY- PROBABLY NOT GOING TO HAPPEN

• LIKELY- PROBABLY WILL HAPPEN

• CERTAIN- DEFINITELY WILL HAPPEN

Multiple Choice

Which four terms are used when using the certainty method?

• Impossible, true, false, certain

• will happen, will not happen, not sure, never will happen

• impossible, unlikely, likely, certain

• yes, no , maybe, unsure

METHOD #2

We can measure probability using a FRACTION

There are 2 ways for us to write our fraction.

• Standard form

• Numerical form

Multiple Choice

Which statement is TRUE about standard form?

• Standard method has all numbers and uses the fraction line

• Standard method uses the term "out of" Example: 4 OUT OF 5

• Standard method uses addition and subtracting

Multiple Choice

Which statement is TRUE about numerical form

• Numerical form uses the term "out of"

• Numerical form uses the fraction line and numbers only

• Numerical form uses symbols like : ! , %, $

Numerical Form

Uses the fraction line (/)

ONLY numbers

Example : 4/5

Use the chatbox to send a fraction in numerical form.

Standard Method

uses the term "out of".

There is NO Fraction line

3 OUT OF 5

7 OUT OF 5

Use the chat box to send a fraction in STANDARD FORM

Let's practice !

Probability practice

Multiple Choice

What is the probability it will be Christmas tomorrow ?

HINT: Think about tomorrows date and Christmas date.

• certain

• unlikely

• likely

• impossible

Multiple Choice

What is the probability the sun will go down

• impossible

• likely

• certain

• unlikely

Multiple Choice

What is the probability you will win the lotto

• Likely

• Unlikely

• Certain

• Impossible

Multiple Choice

What is the probability it will rain in April?

• Certain

• Unlikely

• Impossible

• Likely

Multiple Choice

What is the probability of picking a YELLOW using NUMERICAL FORM?

• 1 out of 10

• 10/10

• 1/10

• 10 out of 20

Multiple Choice

What is the probability of picking GREEN in STANDARD FORM

• 3/4

• 4 OUT OF 10

• 10 OUT OF 4

• 410