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Mean, median, mode, range

- Mean: the average of a set of data.
- Add all numbers in the data set & divide by the total #
- Median: The middle # of the data set.
- Order all the numbers from least to greatest. Find the middle #.
- If there are two middle numbers, find the average of the two middle numbers.
- Mode: The # that occurs the most often in a data set.
- Range: the difference between the smallest & largest # in the data set.

Box & whisker plots

A graph that displays the highest & lowest quarters of data as whiskers, the middle two quarters of the data as a box, & the median.

Quartiles: Each quarter of the graph which represents ¼ or 25% of the data.

To draw a box & whisker plot

- Order numbers in the data set from least to greatest
- Find the median of the entire data set
- The median of the entire data set is called the 2nd quartile in a box & whisker plot
- Find the median of the lower half of the data set
- The median of the lower half of the data set is called the 1st quartile
- Find the median of the upper half of the data set
- The median of the upper half of the data set is called the 3rd quartile
- Draw a box connecting the 1st, 2nd, & 3rd quartiles
- Draw whiskers from the box to the lowest & highest numbers in the data set.

Draw a box & whisker plot

See pg. 32 in pre-alg workbook

mid-term coming up sooner than you think!

10 class days left to the mid-term + 2 days for tests

Mid-term is 20% of your grade this quarter

Covers the entire semester

Will review everything after Thanksgiving

May want to start going back & looking at anything that has given you any problems throughout the semester

Hand back tests

Test corrections due FRIDAY

If you have any questions on problems, be prepared to ask tomorrow in class

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