Question

Ginny rolls two number cubes numbered 1 to 6. Complete the table by determining the theoretical probability of each event.

Events; Rolling double 3s, and Rolling a sum of 7.
Answer choices for rolling double 3s: C AND A ARE WRONG!
A: 1/5 EQUIVALENT
B: 1/36 EQUIVALENT
C: 25% NOT EQUIVALENT
D: NONE OF THE ABOVE
Answer choices for Rolling a sum of 7: C AND D ARE WRONG!
A: 1/5 EQUIVALENT
B: 1/36 EQUIVALENT
C: 25% NOT EQUIVALENT
D: NONE OF THE ABOVE

Answer 1

B: 1/36 EQUIVALENT

D: NONE OF THE ABOVE

Explanation:

Rolling a single 3 is 1/6, rolling another 3 is 1/6 again. SO you multiply the probabilities to find the probability of rolling double 3s. 1/6 × 1/6 = 1/36 so B.

These are all the ways you could roll a sum of 7:

1, 6

2, 5

3, 4

4, 3

5, 2

6, 1

This is 6 of the 36 possible rolls so there is a 1/6 chance of rolling a sum of 7, SO D.