Central Tendencies

Mean: The sum of the terms divided by the number of terms. Add up all of the terms and divide by the number of terms you have added.

Median: The number in the middle of the data set. Write the terms in order from least to greatest and cross off one from each end. Repeat this until left with the middle number. If two numbers remain, find their mean.

Mode: The most common number.

Range: The largest number minus the smallest number.

Outlier: A number that does not fit the data set. For example, if the data set is 2, 100, 105, 110, 115, then 2 is an outlier. Outliers can have a big effect on the mean, but usually do not have a big effect on the median (think about why...).

Students Teaching Students:

Emily and Becky (Central Tendencies, Decimal Operations, Absolute Value, OOOps Slide Show)

Sarah and Allison (Central Tendencies, Multiplying Integers Slide show)

Averages Song:

http://www.youtube.com/watch?v=TD_utDA7P6A

Calculate Averages

http://www.ixl.com/math/grade-6/calculate-mean-median-mode-and-range

Using Charts

http://www.ixl.com/math/grade-6/interpret-charts-to-find-mean-median-mode-and-range