## Algebra 2 Common Core

$$mean = 3.8$$ $$median = 5$$ $$mode = 5$$
To calculate the mean, sum the data values in the set and divide by the number of data values in the set: $$mean = \frac{-3+4+5+5-2+7+1+8+9}{9}=3.8.$$ The median is the middle value of the data set when it is arranged in increasing or decreasing order: $$-3,-2, 1, 4, 5, 5, 7, 8, 9.$$ So $$median = 5.$$ The mode is the value which occurs most often in the data set: $$mode = 5.$$