Box and Whisker Plots

Vocabulary Box-and-whisker – a graph that summarizes a set of data by displaying it along a number line. It consists of three parts: a box and two whiskers The left whisker extends from the minimum to the first quartile. It represents 25% of the data The box extends from the first quartile to the third quartile and has a vertical line through the median. The length of the box represents the interquartile range. It contains about 50% of the data. The right whisker extends from the third quartile to the maximum. It represents about 25% of the data.

WHAT IT LOOKS LIKE

Steps Step 1: Arrange the data in order from least to greatest 132 95 157 104 82 145 61 61 82 95 104 132 145 157 Step 2: Find the minimum, maximum, and median The minimum is 61. The maximum is 157. The median is 104. (If for example if it was 1, 2, 3, 4, 5, 6, 7, 8 then to find the median you would have to add the 4 and 5 and then divide by 2) Example: 4+5 2

Step 3: Find the first quartile and the third quartile 61 82 95 104 132 145 157 First quartile: 82 + 95 2 Third quartile: 132 + 145

EXAMPLES SOLVE AND GRAPH! 45, 17, 91, 78, 23, 64, 34

2. 41, 32, 67, 105, 34, 76, 89, 17

3. 78, 109, 43, 123, 67, 48, 89, 34, 90