Question

7-2 Practice Questions

Due 02/20/211
X 72PS-11
Question Help
Tamara finds the sum of two number cubes rolled at the same time. The chart below shows all
possible sums from the 36 possible combinations when rolling two number cubes. How many times
should Tamara expect the sum of the two cubes be equal to 9 if she rolls the two number cubes
216 times?
Click the icon to view the possible sums.
The sum should be equal to 9 about
time(s).
Enter your answer in the answer box and then click Check Answer
A parts showing
Clear Al
CAS
Review progress
Question
Back
Next →
O

Answer 1

24

Explanation:

There are 36 possible outcomes when rolling 2 dice. The sums range from 2 to 12. There are 4 ways of rolling a 9: 3, 6; 4, 5; 5, 4; 6, 3.

p(sum of 9) = 4/36 = 1/9

1/9 of the rolls are expected to have a sum of 9.

1/9 * 216 = 24