PROBABILITY PART I

INTRODUCTION 

Probability is the chance of an event occurring.
Probability is equivalent to the number of ways of achieving success
The total number of possible outcomes
For example, the probability of flipping a coin and it being heads is ½, because there is 1 way of getting a head and the total number of possible outcomes is 2 (a head or tail). We write P(heads) = ½ .

The probability of something which is certain to happen is 1.
The probability of something which is cannot happen is 0.
The probability of something not happening is 1 minus the probability that it will happen.
This video is a guide to probability. Expressing probability as fractions and percentages based on the ratio of the number ways an outcome can happen and the total number of outcomes is explained.

SINGLE EVENTS

Example 1.
There are 6 beads in a bag, 3 are red, 2 are yellow and 1 is blue. What is the probability of picking a yellow?

The probability is the number of yellows in the bag divided by the total number of balls, i.e. 2/6 = 1/3.

Example 2.
Set A contains {odd number greater than 5 less than 21}.
a. Find the probability of getting a number greater than 16.

SOLUTION
Set A={7,9,11,13,15,17,19}
Numbers greater than 16 are {17,19}
2/7


Click on the link below to watch a video tutorial on this lesson....... 👇👇👇
https://youtu.be/cc4xeYKVXfg

END OF LESSON ASSIGNMENT 

There is a bag full of coloured balls, red, blue, green and violet. Balls are picked out and replaced. Kofi did this 100 times and obtained the following RESULTS.

• Number of blue balls picked out: 30
• Number of red balls: 20
• Number of green balls: 45
• Number of violet balls: 5

a) What is the probability of picking an violet ball?
b. What is the probability of picking the blue balls