To make a Box and Whisker Line Graph Follow these steps:

Keep in mind that the key word here is middle. You will be

finding middle by using the median. Then you look at the two halves created by the median and find the medians of the lower half and then the upper half. These sections are called the quartiles.

Use these numbers :

1 2 3 4 5 6 7 8 9

Plot them on a line

Since 1 2 3 4 are on

one side and 6 7 8 9

are on the other side of 5, you can see that 5 is exactly in the middle. That makes it a median.

Box and Whisker

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The quartiles are similar to a ruler....the median divided it in 2 halves, then each half was in half again.

Q 1 Q 2 Q 3 Q4

1 2 2.5 3 4 5 6 7 7.5 8 9

Quartiles 2 and 3 are your average range.(In the box) Quartile 1 is below average and Quartile 4 is above average. These are the whiskers.

It has been said that the most important numbers can be described as the 5 number summary :

The median, the data points creating the division of quartiles and the two extremes.

Prof

Try the formula:

Median is n+1/2

where n is

the number

in the data set