Question

what box and whiskers and how do you do it

Answer 1

http://www.worsleyschool.net/science/files/box/plot.html walks you through each step.

Answer 2

http://ellerbruch.nmu.edu/cs255/jnord/boxplot.html
this may help but it's easier to explain by showing with numbers. but a box and whisker plot breaks up a data set into top 25% two middle 25%'s and a lower 25%. the middle of the plot is the median.