Answer:
11.
Step-by-step explanation:
Mean may be defined as the sum of all the observations divided by the total number of observations.
Mean can be calculated by the formula:
Mean = sum of observation/ total no. of observation
Here, the total number of observations are 7.
Mean = 10+13+11+12+12+11+8/7
Mean = 11.
Thus, the answer is 11.