1. Discrete Math Section 17.2 Represent data using a box and whisker plot.
A box and whisker plot is a method for dividing a set of data into four parts called quartiles.
Lower extreme – smallest value of a set of data
Upper extreme – largest value of a set of data
Lower quartile – median of the items less than the median
Upper quartile – the median of the items greater than the median
Box – extends from the lower to the upper quartiles
Whiskers – extend from the quartiles to the extremes
Range – the difference from between the extremes
Interquartile range – difference between the quartiles
Outliers – any data item whose distance to the nearer quartile exceeds 1.5 times the interquartile range

2. example
The ages of the 1st 41 presidents at the time they took office expressed as a stem and leaf plot
4 |
5 |
6 |
7 | 0
Find the extremes
Find the median and the lower and upper quartiles
Find the interquartile range
Are there any outliers?
Draw a box and whisker plot of the data

3. example Consider the sets of score from two different algebra classes
1st class 72,74,78,78,80,81,85,87,88,90,91,92,96,98,99,99
2nd class 60,64,65,69,70,73,74,78,81,82,84,90
Express the data in back to back stem and leaf plots with 8 stems
Express the data using 2 box and whisker plots

4. Use a graphics calculator to represent the data
Calculator exercises
Use a graphics calculator to represent the data
3,6,12,8,4,9,12,7,9,14,9,2,9,3,11,10,14,2,35
Using measures of central tendencies
Using a box and whisker plot

5. Assignment
page 651
problems 2,3,4,6,7