Mean: We add them all and divide by the number of them: \(\frac{89+81+77+77+89+91}{6}\) = 84
Median: We put them in order and take halfway inbetween the two middle values: 77, 77, 81, 89, 89, 91. \(\frac{81+89}{2}\) = 85
Mode: We find the most common value. In this case both 77 and 89 appear twice, so 77 and 89.
