Median and Quartiles

This is a vertical box n whisker. What is the upper quartile?

• 63

• 77

• 80

• 60

In a data set with 25 different values, if you change the two smallest values in the data set to smaller values, the median will not be changed.

• True

• False

What do quartiles split data up into?

• halves

• thirds

• fourths

• fifths

What is an interquartile range?

• The difference between the upper and lower quartiles.

• The measure of the middle half of the data.

• A measure of variability.

• All of the above

• None of the above

The table shows the average monthly temperature for St. Louis. The lower quartile (Q1) for this data is ______.

The table shows the average monthly temperature for St. Louis. The upper quartile (Q3) for this data is ______.

The table shows the average monthly temperature for St. Louis. You have already found the lower and upper quartiles. The Interquartile Range (IQR) is ________.

This list shows the different precipitation amounts in 13 western US states. The lower quartile (Q1) of this list is ________.

Write your answer as a decimal.

This list shows the different precipitation amounts in 13 western US states. The upper quartile (Q3) of this list is ________.

This list shows the different precipitation amounts in 13 western US states. The Interquartile Range (IQR) of this data is ___________. Write your answer as a decimal.