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svetlana [45]
3 years ago
5

Two number cubes are rolled.

Mathematics
2 answers:
hichkok12 [17]3 years ago
6 0

Answer:

When two number cubes  are rolled,

Sample space= Total Possible outcome {11,22,33,44,55,66,12,21,13,31,14,41,15,51,16,61,23,32,24,42,25,52,26,62,34,43,35,53,36,63,45,54,46,64,56,65}=36

Probability of an event = \frac{\text{Total favorable outcome}}{\text{Total possible outcome}}

Sum of 4 is obtained when ={13,31,22}=3

Probability of getting 4 when 2 number cubes are rolled= \frac{3}{36}=\frac{1}{12}

Sum of the numbers is greater than 9= 10, 11,12={55,64,46,56,65,66}=6

Probability of getting(Sum of the numbers is greater than 9)=\frac{6}{36}=\frac{1}{6}

miv72 [106K]3 years ago
3 0

The sample space is the set of the 36 possible couples:

\Omega = \{(x,y): 1\leq x\leq 6,\ 1\leq y\leq 6\}

So, we have

(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)

As for the probability of rolling a sum greater than 9, just count how many cases satisfy the request, and divide the number of cases by the cardinality of the sample space: the good rolls are

(3,6)\ (4,5)\  (4,6)\ (5,4)\  (5,5)\  (5,6)\  (6,3)\  (6,4)\  (6,5)\  (6,6)

So, 10 out of 36 rolls are good, leading to a probability of

\dfrac{10}{36} = \dfrac{5}{18}

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