Probability Explained | Independent And Dependent Events | Probability And Statistics | Khan Academy


We give you an introduction to probability through the example of flipping a quarter and rolling a die.

Practice this lesson yourself on KhanAcademy.org right now:

Watch the next lesson:

Probability and statistics on Khan Academy: We dare you to go through a day in which you never consider or use probability. Did you check the weather forecast? Busted! Did you decide to go through the drive through lane vs walk in? Busted again! We are constantly creating hypotheses, making predictions, testing, and analyzing. Our lives are full of probabilities! Statistics is related to probability because much of the data we use when determining probable outcomes comes from our understanding of statistics. In these tutorials, we will cover a range of topics, some which include: independent events, dependent probability, combinatorics, hypothesis testing, descriptive statistics, random variables, probability distributions, regression, and inferential statistics. So buckle up and hop on for a wild ride. We bet you’re going to be challenged AND love it!

About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to KhanAcademy’s Probability and Statistics channel:

Subscribe to KhanAcademy:
Probability Explained | Independent And Dependent Events | Probability And Statistics | Khan Academy

36 Replies to “Probability Explained | Independent And Dependent Events | Probability And Statistics | Khan Academy”

  1. I understand the concept of “or” but at the same time I have a difficulty understanding P(1 or 6) like are we finding the probability of the chance of the single independents that will happen at once? If they were asking individually of p(1) or p(6) it would have been 1/6 or 1/6 but since they are asking one probability question of P(1 or 6) of a single event, you would add it?

  2. we should use probability when there are equally likely possible outcomes. so we should measure before hand if the system is equally likely and not biased before applying probability

  3. Here is something I cannot understand and haven’t been able to find an answer for. If I want to find the Ace of Spades from a 52 card deck I have a 2/52 chance if I took out two cards without looking at them. When I look at the first card I have a 1/52 chance that it is right, and if it is wrong the next card has a 1/51 chance. This is a slightly greater probability than 2/52. So why is it not the same?

    Someone please help!

  4. what is the probability that someones comment you read on this video, that person who commented is now dead? and the comment will sit here for ever

  5. what about “what is the probability that you role a 3, 4, and 6 if you roll the dice 10 times?” I don’t understand how you could do this?

  6. i have quiries regarding analytics can u help me out and solve the questions please provide mail adress so that i can drrop a mail

  7. Actually theres a 51 % percent chance that the coin would land out as heads. If spun head has a bigger chance of showing up!!! XD

  8. I have a question that I’d appreciate if someone could help me with. Me and my friend laid a deck of 52 cards face down…I picked a card and said it out loud..2 of clubs. We then tried to turn that card face up last…and we achieved this. What are the odds of this?

  9. what if i were playing poker and wanted to push 2 people off of a hand with a bluff would i multiply the percents that each would fold or would add the percents? Does anyone have the answer?

  10. Me and my friend was wondering if it possible and how you would calculate the possibly of encounter a person/persons. Such as what would the likely hood you run into a taxi in NYC. Not what we are wondering but it easy example.

  11. What is the probability of my coin to collide with the blade of fan if I were to toss it towards the fan in ideal conditions (No Gravity, no air resistance and the coin is not flipping) of I am given with the velocity of coin,the area of fan blades and area of vulnerability of coin to collide (the total area of the path on which the fan rotates), speed of fan’s rotation,and the width of blade and coin?? 😉

  12. guyyyys!!!! what’s wrong with you , he just want to explain probability !!!! not probability of getting head ! stupid students 🙂

  13. A coin is tossed 3 times , what is probability of of getting a head and a tail alternatively ? what does alternatively mean here?

Leave a Reply

Your email address will not be published. Required fields are marked *