Question

72. If two dice all tossed find the
probability of rolling a rolling a sum
either 7 or 9*
O 1/6
O 1/9
O 5/19
O None of the above​

Answer 1

Answer:

1/6th. or approximately 16.67%.

there are 36 possibilities (6 x 6 = 36).

1/36 = 0.0277777777 in perpitude.

each of those possibilities is approximately 2.78% probable.

there are 6 possibilities for the total of two six-sided dice to have a sum of 7:

1+6, 2+5, 3+4, 4+3, 5+2, 6+1.

6/36 = (6/6)/(36/6) = 1/6.

About 16.67%.

EDIT: before the question merge, the only sum requested was 7.

there are 4 possibilities for the total of two six-sided dice to have a sum of 5:

1+4, 2+3, 3+2, 4+1.

4/36 = 1/9. or 0.11111111111 in perpitude.

or approximately 11.11%.

Now… adding the possibility for a sum of 7 (remember 6/36) with the possibility for a sum of 5 (remember 4/36) yields:

10/36 = 5/18 = 0.2777777777 in perpitude.

or approximately 27.78%.

this can also be confirmed by adding 16.67% and 11.11%.

about 27.78%.