2
Probability Lecture 1 (
§
6.2 and
§
6.3)
Oct. 78
The
Sample Space
of an
Experiment
is the set of out
comes.
(1) Flip a coin
(2) Roll a die
(3) Observe a queue
(4) Flip 4 coins:
HHHH
HTHH
THHH
TTHH
HHHT
HTHT
THHT
TTHT
HHTH
HTTH
THTH
TTTH
HHTT
HTTT
THTT
TTTT
1
1
1
2
1
3
1
4
1
5
1
6
2
1
2
2
2
3
2
4
2
5
2
6
3
1
3
2
3
3
3
4
3
5
3
6
4
1
4
2
4
3
4
4
4
5
4
6
5
1
5
2
5
3
5
4
5
5
5
6
6
1
6
2
6
3
6
4
6
5
6
6
An
Event
is simply a set of outcomes
longer than 5”
were more tails than heads”
(5) ”The number on the red die is larger than the num
ber on the blue die”, ”Roll a 7” & ”Roll a 7 or 11”
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Events in one setting can become the outcomes in another
setting. In general, these outcomes are not all equally likely.
Consider Flipping a Coin 6 Times and observing the num
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 Fall '09
 NA
 Probability, Prime number, Coin, Roll, Erdős–Woods number, HHT T

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