ISDS lesson 2 notes

Probability

Probability is simply how likely something is to happen. Whenever we're unsure about the outcome of an event, we can talk about the probabilities of certain outcomes—how likely they are.

To find the probability of an event happening we use the formula

Probability=number of desired outcomes/total number of outcomes

​For example, Let’s look at the probability of getting an even number when a die is rolled.The desired outcome is getting an even number. There are 3

3 even numbers on a die. The total number of possible outcomes is 6 since there are 6

6 numbers on a die.

The probability of getting an even number=number of desired outcomes/total number of outcomes=3/6=1/2 or 50%

If something has a probability of 0, then it is impossible and if something has a probability of 1 then it is certain.

We use the notation P(event) to represent the probability of an event happening.

For example, If we wanted to write the probability of getting a 1 we could write P(1).

We hope that it was useful. If you have questions, you may contact Ravshan Malikov

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