Median and Quartiles

Find the Quartile 3 of the box and whisker plot.

• 58

• 64

• 60

• 66

What is the first thing you should do before finding the median or the mode?

• Start crossing numbers off

• Put numbers in order from least to greatest

• List the numbers how they are

• Look for repeats

Find the median of the data set:
18, 19, 17, 14, 20, 20, 15, 21

• 17

• 18.5

• 20

• 14

Find the median of this data (hint: order this data on paper--you will see it again in some more questions!) Hours Sixth Graders Spent Playing Video Games This Week 7, 0, 10, 4, 20, 2, 11

• 4

• 7

• 10

• 11

Find the first quartile of this data (hint: this is the same data as the previous question)
Hours Sixth Graders Spent Playing Video Games This Week
7, 0, 10, 4, 20, 2, 11

• 0

• 2

• 11

• 20

Find the third quartile of this data (hint: this is the same data as the previous question)

Hours Sixth Graders Spent Playing Video Games This Week

7, 0, 10, 4, 20, 2, 11

• 7

• 2

• 11

• 0

Find the interquartile range (IQR) of this data (hint: this is the same data as the previous question)

Hours Sixth Graders Spent Playing Video Games This Week

7, 0, 10, 4, 20, 2, 11

• 11

• 2

• 7

• 9

The __________ is the middle number, or the mean of the two middle numbers, of the ordered data in a set.

• mean

• range

• median

• mean absolute deviation

__________ are values that divide the data set into four equal parts.

• outliers

• average

• measures of variation

• quartiles

The _________ is the median of the lower half of the set of data.

• median

• mean

• first quartile

• mode