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What is Certain Event?
Grade Level:
Class 2
All STEM domains, Finance, Economics, Data Science, AI, Physics, Chemistry
Definition
What is it?
A Certain Event is an event that will definitely happen. Its probability is 1, meaning it is 100% sure to occur. You can be absolutely certain about it.
Simple Example
Quick Example
Imagine your school is having its annual sports day. If it is announced that 'the sun will rise tomorrow during the sports day', this is a certain event. We know the sun always rises every day.
Worked Example
Step-by-Step
PROBLEM: Identify if 'a student will get an even number when rolling a standard dice with numbers 1, 2, 3, 4, 5, 6' is a certain event. --- STEP 1: List all possible outcomes when rolling a standard dice. The outcomes are {1, 2, 3, 4, 5, 6}. --- STEP 2: Identify the outcomes that are even numbers. The even numbers are {2, 4, 6}. --- STEP 3: Check if ALL possible outcomes are even numbers. No, outcomes like 1, 3, 5 are odd. --- STEP 4: Since not all outcomes are even, getting an even number is not 100% sure. You could get an odd number. --- ANSWER: No, getting an even number when rolling a standard dice is NOT a certain event.
Why It Matters
Understanding certain events helps us predict outcomes in science and technology. Engineers use this to design safe buildings, knowing gravity will always pull things down. In data science, knowing what is certain helps us focus on unpredictable parts, making predictions more accurate for things like weather forecasting or stock market analysis.
Common Mistakes
MISTAKE: Thinking an event that is very likely to happen is a certain event. | CORRECTION: A certain event MUST happen, with no chance of it not happening. 'Very likely' means there's still a small chance it might not.
MISTAKE: Confusing 'certain event' with 'possible event'. | CORRECTION: A certain event is guaranteed. A possible event might happen, but also might not.
MISTAKE: Believing an event that happened many times in the past is automatically a certain event for the future. | CORRECTION: Past occurrences don't guarantee future certainty. A certain event is based on fundamental rules or definitions, not just past observations.
Practice Questions
Try It Yourself
QUESTION: Is 'The next number after 5 will be 6' a certain event? | ANSWER: Yes
QUESTION: You have a bag full of only red ladoos. Is picking a red ladoo from the bag a certain event? | ANSWER: Yes
QUESTION: Your friend says, 'It will rain tomorrow in Delhi.' Is this a certain event? Explain why or why not. | ANSWER: No, it is not a certain event. While it might rain, weather is unpredictable, and it might also not rain. There is a possibility for both outcomes.
MCQ
Quick Quiz
Which of the following is a certain event?
Flipping a coin and getting heads.
Drawing a blue ball from a bag containing only blue balls.
Winning a lottery ticket.
It will snow in Chennai next week.
The Correct Answer Is:
B
Option B is correct because if a bag contains ONLY blue balls, you are 100% sure to pick a blue ball. The other options have other possibilities or are highly unlikely.
Real World Connection
In the Real World
When you buy a train ticket from Mumbai to Delhi, it's a certain event that the train will travel from Mumbai towards Delhi (even if there are delays). Similarly, when you plug in your mobile charger, it's a certain event that if the power is on, your phone will start charging, based on the laws of electricity.
Key Vocabulary
Key Terms
PROBABILITY: The chance of an event happening. | OUTCOME: A possible result of an event. | EVENT: Something that happens or can happen. | CERTAIN: Absolutely sure to happen.
What's Next
What to Learn Next
Now that you understand certain events, you can explore 'Impossible Events' and 'Possible Events'. These concepts will help you understand the full range of how likely or unlikely something is to happen, which is key to understanding probability.
