Measures of Variability

Measures of Variability

3/28/2022

Fill in the Blank

Find the median: 3, 5, 7, 4, 3, 13

Fill in the Blank

The science scores of nine students in a class are 72, 94, 56, 71, 88, 95, 59, 98 and 60. What is the median of the scores?

Quartiles

​A quartile divides data into three points- a lower quartile (Q1), the median (Q2) and an upper quartile (Q3). *This forms 4 groups in the data set.

How to find the Quartiles?

1. Line the numbers up in numerical order.

2. ​Find the Median (Q2)

   1. ​This splits the data set into halves.

3. The lower quartile (Q1) is the median of the lower half.

4. The upper quartile (Q3) is the median of the upper half.

​Ex. 28, 29, 12, 13, 4, 5, 9, 11, 12

Fill in the Blank

Find the Median (Q2) of the following data set.

5, 12, 9, 5, 18, 22

Fill in the Blank

Find the Lower Quartile (Q1) of the following data set.

5, 12, 9, 5, 18, 22

Fill in the Blank

Find the Upper Quartile (Q3) of the following data set.

5, 12, 9, 5, 18, 22

Fill in the Blank

Find the Median (Q2) of the following data set.

12, 13, 19, 11, 9, 5, 4,

Fill in the Blank

Find the Lower Quartile (Q1) of the following data set.

12, 13, 19, 11, 9, 5, 4

Fill in the Blank

Find the Upper Quartile (Q3) of the following data set.

12, 13, 19, 11, 9, 5, 4,