Quartile Percents

The 25th percentile does correspond to

• the upper quartile

• the median

• the lower quartile

the 75th percentile does correspond to

• the upper quartile

• the median

• the lower quartile

The 50th percentile does correspond to

• the upper quartile

• the median

• the lower quartile

• The median

• A measure of the spread of the 50% of the data

• The interquartile

A measure of the spread of the central 50% of the data is given by

• The median

• The IQR ( interquartile)

• The range

The upper quartile is the

This data show the length of time, in minutes, it took 11 students to complete an essay;

15, 18, 19, 21, 22, 25, 26, 26, 28, 30, 31

The lower quartile, median and upper quartile are respectively

• 15 - 25 - 31

• 19 - 25 - 28

• 21 - 25 - 26

The box plots above shows information about the times taken by 40 girls to complete the same puzzle. The minimum and maximum values are

• 15 and 46

• 23 and 34

• 0 and 60

The box plots above shows information about the times taken by 40 girls to complete the same puzzle. The interquartile and the median are

The box plots above shows information about the times taken by 40 girls to complete the same puzzle. Thick the right statement(s)

• 50% of the girls completed the puzzle in less than 30 seconds

• 25% of the girls completed the puzzle in more than 23 seconds

• 25% of the girls completed the puzzle in more than 34 seconds

• 75% of the girls completed the puzzle in less than 34 seconds