ROLL A PAIR OF DICE
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Transcript of ROLL A PAIR OF DICE
ROLL A PAIR OF DICE
AND ADD THE NUMBERS
Possible Outcomes:
(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)
There are 6 x 6 = 36 equally likely
A more compact sample space might list only the possible sums.
These outcomes are not equiprobable and must be weighted as follows:
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
6611 2112
6556
41322314
63544536
312213
645546
615243342516
5142332415
6253443526
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36
T = the event the sum is a multiple of 3
T = { 3, 6, 9, 12 } 2/36 5/36 4/36 1/36
P(T) = 2/36 + 5/36 + 4/36 + 1/36 = 12/36
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36
E = the event the sum is greater than 8
E = { 9, 10, 11, 12 } 4/36 3/36 2/36 1/36
P(E) = 4/36 + 3/36 + 2/36 + 1/36 = 10/36
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36
T = the event the sum is a multiple of 3
T = { 3, 6, 9, 12 } P(T) = 12/36 2/36 5/36 4/36 1/36
E = the event the sum is greater than 8
E = { 9, 10, 11, 12 } P(E) = 10/36 4/36 3/36 2/36 1/36
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36
T = { 3, 6, 9, 12 }P(T) = 12/36
2/36 5/36 4/36 1/36E = { 9, 10, 11, 12 }P(E) = 10/36
4/36 3/36 2/36 1/36
T E= the event the sum is a multiple of 3 AND greater than 8 =
{ 9, 12 } P(T E) = 5/36
T E= the event the sum is a multiple of 3 OR greater than 8
P(T E) = P(T) + P(E) - P(T E)
= 12/36 + 10/36 - 5/36 = 17/36
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36
T = { 3, 6, 9, 12 }P(T) = 12/36
2/36 5/36 4/36 1/36E = { 9, 10, 11, 12 }P(E) = 10/36
4/36 3/36 2/36 1/36
T E= the event the sum is a multiple of 3 AND greater than 8 =
{ 9, 12 } P(T E) = 5/36
T / E= the event the sum is a multiple of 3 IF greater than 8
P(T / E) = P(T E) = 5/36 = 5 P( E ) 10/36 10
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }
The SAMPLE SPACE =
1/36 1/362/36 2/366/365/36 5/364/36 4/363/36 3/36