Mean
The mean is the average of the numbers.
Calculate the mean: Add up all the numbers, then divide by how many numbers there are.
-10 + -10 = -20 + 20 = 0
0 / 3 = 0
Mean = 0
Median
To find the median, the data should be arranged in order from least to greatest. Then, find the most middle number.
-10, -10, 20
As you can see, -10 is the most middle number.
Median = -10
Mode
The mode is the number that occurs most frequently in the set of numbers.
-10, -10, 20
As you can see, -10 occurs more frequently because there are two of them.
Mode = -10