PROBABILITY
Probability can be defined as chance(s)/ like hood of something occurring. .
This graph tells you how to put probability into words
This graph tells you how to put probability into words
In probability fractions is involved. The sum of all the chances must equal 1
If there is no chance of something happening, (0) percent then we say it is impossible.
If something is uncertain, then we say 25 percent, (1/4). Unlikely means almost certain it wont happen, but it could.
Even chance means there is half chance (50 percent) it will happen and half chance 50 percent it wont happen. Therefore it could swing anyway.
Likely means that this is almost certain to happen, but it might not. There is a 75 percent chance it would.
Certain means 100 percent chance its happening, and nothing can prevent it from happening.
If there is no chance of something happening, (0) percent then we say it is impossible.
If something is uncertain, then we say 25 percent, (1/4). Unlikely means almost certain it wont happen, but it could.
Even chance means there is half chance (50 percent) it will happen and half chance 50 percent it wont happen. Therefore it could swing anyway.
Likely means that this is almost certain to happen, but it might not. There is a 75 percent chance it would.
Certain means 100 percent chance its happening, and nothing can prevent it from happening.
Examples
![Picture](/uploads/2/4/5/3/24533432/138420335.jpg?220)
When a coin is flipped, there are two ways it could land, Heads or Tails
Therefore the chances of it landing on either side is 1/2, because there are only possibilities
Heads = 1/2
Tails = 1/2
Therefore the chances of it landing on either side is 1/2, because there are only possibilities
Heads = 1/2
Tails = 1/2
![Picture](/uploads/2/4/5/3/24533432/816765436.jpg?170)
A dice has six sides numbered 1 - 6 with dots. If a die is rolled once, the probability of getting any of these numbers is 1/6. Because there are six possible outcome, and six ways the die could end up when rolled.
The Possibility of getting any of the numbers in the die is
1= 1/6
2=1/6
3= 1/6
4= 1/6
5= 1/6
6= 1/6
Probability of something happening can be calculated by : Number of ways it can happen
The Possibility of getting any of the numbers in the die is
1= 1/6
2=1/6
3= 1/6
4= 1/6
5= 1/6
6= 1/6
Probability of something happening can be calculated by : Number of ways it can happen
Total Number of outcomes
Example 3
There are 8 balls in a bag of which 5 are red and 3 are blue.
What are the chances of SAM picking a blue ball from the bag.
Total Number of balls = 8, Therefore 8 balls could be picked up.
Number of blue balls = 3
Number of red balls = 5
Probability of blue ball = 3/8.
Example 3
There are 8 balls in a bag of which 5 are red and 3 are blue.
What are the chances of SAM picking a blue ball from the bag.
Total Number of balls = 8, Therefore 8 balls could be picked up.
Number of blue balls = 3
Number of red balls = 5
Probability of blue ball = 3/8.
Exercises
![Picture](/uploads/2/4/5/3/24533432/160357352.png?159)
1) What is the probability that the wheel stops at red
2) What is the probability that the wheel stops at red, yellow or green
2) What is the probability that the wheel stops at red, yellow or green
3) If a dice is thrown, what is the probability it will be
a) a 3 b) a zero c) Odd number d) Even number e) number less than seven f) a prime number
a) a 3 b) a zero c) Odd number d) Even number e) number less than seven f) a prime number
![Picture](/uploads/2/4/5/3/24533432/654428116.gif)
5) What is the probability that the wheel stops at an even number
6) If a dice is rolled a 100 times, how many times will it land on 6
7) In a class, there are 40 students of which 12 are from Nigeria, 20 from Canada and 8 from England. If the teacher picked any random student from class, what is the probability someone from England will not be picked
7) In a class, there are 40 students of which 12 are from Nigeria, 20 from Canada and 8 from England. If the teacher picked any random student from class, what is the probability someone from England will not be picked