25linm
24.06.2019 •
Mathematics
Two number cubes are rolled for two separate events: event a is the event that the sum of numbers on both cubes is less than 10. event b is the event that the sum of numbers on both cubes is a multiple of 3. complete the conditional-probability formula for event b given that event a occurs first by writing a and b in the blanks: p( a0 | a1) = p( a2 ∩ a3) p( a4)
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Ответ:
The answer is
Step-by-step explanation: Given that two number cubes are rolled for two separate events A and B, where
A = the event that the sum of numbers on both cubes is less than 10
= {(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) ,(5,1), (5,2), (5,3), (5,4), (6,1), (6,2), (6,3)}
and
B =the event that the sum of numbers on both cubes is a multiple of 3
= {(1,2), (1,5), (2,1), (2,4), (3,3), (3,6), (4,2), (4,5), (5,1), (5,4), (6,3), (6,6) }
Let 'S' be the sample space for the experiment so that n(S) = 36.
Therefore, A and B = The event that the sum of numbers on both the cubes is less than 10 and multiple of 3
= {(1,2), (1,5), (2,1), (2,4), (3,3), (3,6), (4,2), (4,5) ,(5,1), (5,4), (6,3)}.
So, n(S) = 36, n(A) = 30, n(B) = 12 and n(A and B) = 11.
Hence, the conditional probability for the event B given that event A has already occured is given by
where,
Therefore,
Thus, the required conditional probability is
Ответ:
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Step-by-step explanation: