Calculating Probabilities
If a set of events have an equal chance of occurring, it is possible to calculate probabilities.
For example, you can calculate the probability of rolling a 4 on a die because the 4 has the same chance of occurring as the other numbers.
Calculating Probabilities
If you can calculate probabilities, you can use this simple method:
The probability of an event happening
The number of results you want
The number of possible results
=
Calculating Probabilities
If you can calculate probabilities, you can use this simple method:
The probability of rolling a 4 on a normal die
1 side with the number 4
6 possible sides
=
Calculating Probabilities
If you can calculate probabilities, you can use this simple method:
The probability of rolling a 4 on a normal die
1
6=
Calculating Probabilities
Which of these statements are true about the word MATHEMATICAL?
•The probability of picking a vowel is 50 % because a letter picked is either a vowel or it isn’t.
•The probability of picking a vowel is 5
because there are 5 vowels out of 12
12 letters.
False, there are less vowels than consonants.
True
Calculating Probabilities
car
walk
bus
bike
otherHow class 6b get to school
Decide which of these statements are true.
This spinner represents all of class 6B
Calculating Probabilities
car
walk
bus
bike
other
The chance of landing on a person who said bike or car is the same as landing on a person who walks.
The chance of getting “bike” is the same as getting “car”
True
False
Calculating Probabilities
car
walk
bus
bike
other
The chance of getting “car” is 1
2
The chance of getting car is 25 %
False
True