Introduction to Box and Whisker

BOX PLOTS

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How to find the range

Find the Maximum and minimum numbers

Subtract the Maximum and the minimum

How to find the median

First, order the data set from least to greatest. To find the median, find the middle number. If there is no middle number, find the two middle numbers and then add them together and divide them by 2.

How to find quartile 1 and quartile 3

Find the median between the lowest number and the median of the entire range. That is called quartile 1 (Q1). To find quartile 3, find the median between the highest number and the median of the entire range. That is called quartile 3 (Q3)

Subtract the first quartile from the third quartile to get the interquartile range.

how to find Interquartile range

Multiple Choice

James and Angie were riding bikes, the box plot shows how many miles they each rode on different days that week.

What is the interquartile range of James's bike rides?

• IQR = 6

• IQR = 9

• IQR = 10

• IQR = 4

Fill in the Blanks

Draw

thry draw a box plot with:

- A median of 6

- a range of 7

- and an interquartile range of 3

Multiple Choice

Find Q1 and Q3

5, 10, 15, 20, 25, 30, 35, 40, 45,

• Q1= 15

  Q3= 35

• Q1= 10

  Q3= 40

• none of these

• all of these

THE END