Answer:
<h2>C. median</h2>
Step-by-step explanation:
Notice that the middle number of times refers to the median.
In statistics, the median is defined as the central value of a data set, literally, the value which is placed in the exact middle.
To find the median, first we need to order the data set.
1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5
Then, we find the value in the exact middle. Notice that 3 is the middle number, because it has 7 values at each side. So, the median is 3.
Therefore, the right answer is C. median, because that's the statistic measure that indicate the middle number of a data set.