The probability of getting 7 tails in a row is 1/128. How come? We find the probability for EACH tails first. Any particular outcome is 1 out of 128 of the total number of outcomes. What's the probability of getting EXACTLY one heads? Watch the instructor explain starting at 2:20.
Probability -Flipping a Coin (Part 2) is a free educational video by Khan Academy.It helps students in grades 7 practice the following standards 7.SP.5,7.SP.8,7.SP.8.a.
1. 7.SP.5 : Understand that the probability of a chance event is a number between 0 and 1 that expresses the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0 indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and a probability near 1 indicates a likely event..
2. 7.SP.8 : Find probabilities of compound events using organized lists, tables, tree diagrams, and simulation..
3. 7.SP.8.a : Understand that, just as with simple events, the probability of a compound event is the fraction of outcomes in the sample space for which the compound event occurs..
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