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Statistics and Probability Videos 134 videos
SAT Math: Statistics and Probability Drill 1, Problem 2. If the four largest numbers in the set were doubled, what would happen to the median...
SAT Math 1.4 Statistics and Probability. If two standard 6-sided dice are rolled, what is the probability that the sum of the dice will be gre...
SAT Math 1.5 Statistics and Probability. If Silas draws one card, then places it in his pocket and draws another, what is the probability that...
CAHSEE Math 6.4 Statistics, Data, and Probability I 214 Views
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Description:
Statistics, Data, and Probability I: Drill Set 6, Problem 4. What is the probability of rolling a four and then rolling an even number on a fair-numbered die?
Transcript
- 00:03
Here's a boring, unshmoopy question you'll find on an exam somewhere in life.
- 00:08
What is the probability of rolling a four and then rolling an even number on a fair-numbered die?
- 00:15
And here are the potential answers...
- 00:17
It's a vanilla two-step dance in Probabilityland.
- 00:21
There are 6 sides to a die.
Full Transcript
- 00:23
As long as you're not engaged in a role-playing game in your parents' basement.
- 00:30
Rolling any one number carries a 1 in 6 chance.
- 00:34
Then we roll a second time and, since there
- 00:36
are 3 even numbers out of six...
- 00:39
...our odds are 3 out of 6 or 1 out of 2 on that second die...
- 00:43
... or 50-50 in gambler lingo.
- 00:45
To get the total odds of both things happening,
- 00:49
we just multiply them -- and we get: 1/6 times 1/2 which is one-twelfth...
- 00:54
and the answer is B.
- 00:56
In gambler lingo, we're guessing that would be 50... 600?
- 01:01
Doesn't have quite the same ring to it as that 50-50 thing...
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