Stem and Leaf Plots
This video covers how to set up a stem and leaf plot and use it to find the mean and median of a set of numbers.
|Statistics||Charts, Graphs, and Tables|
It's basically a way of organizing data that shows the relationship of each value to the
other values. To make a stem-and-leaf plot, create the "stem"
by listing the digits with the largest place value to the left of a vertical line.
In this case, we have the tens place...5 for 50, 4 for 40, 3 for 30, and 2 for 20.....
The remaining digits... those in the ones place...
...will be written to the right of the vertical line to create and organize the "leaves."
Now that Kat has finished organizing, she decides that she wants to eat the middle leaf
first. To find the middle leaf, also known as the
median... ... we can simply cross out one number from
the top and bottom until we reach the middle number.
Unfortunately, Kat has found that the median lands between 47 and 45.
She doesn't have a leaf labeled "46".. ...so she settles for the next best thing...
the leaf with the average value. To find the average, or mean, we just have
to add up the numerical values of all the leaves...
... and divide by the total number of leaves. All of them added together equals 760. When
we divide that by the total number of leaves... 18... it gives us roughly 42.2.
Finally, Kat can lie down and try to sleep off her food coma.