Answer:
7.5 hours
Step-by-step explanation:
The mean is found by adding up the total of the numbers, then dividing the sum over the number of numbers.
Here, it is: (0 + 2 + 8 + 8 + 8 + 8 + 8 + 8 + 10 + 10 + 10 + 10)/12.
That is equal to 90/12, which is equal to 7.5 hours.
