Quartiles and Percentiles from cumulative frequency graphs.

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Estimate how many balls had a weight of less than 80 g.

Write the figure only

(a)  

Estimate how many balls had a weight of 130 g or more.

• 78

• 22

• 11

• 32

What is the median length?

• 40.5 cm
• 30 cm
• 24.5 cm
• 32 cm

Approximately how many items were longer than 34 cm?

• None
• 8
• 7.5
• 7

What is the Lower Quartile Length?

• 28 cm
• 30 cm
• 33 cm
• 20 cm

What is the Upper Quartile Length?

• 28 cm
• 30 cm
• 33 cm
• 20 cm

What is the Interquartile Range?

• 28 cm
• 12 cm
• 33 cm
• 5 cm

the difference between the upper and lower quartiles

• interquartile range
• median
• mode
• mean

This cumulative frequency graph shows the speeds in kmh^-1 of cyclists passing a certain point on a race track.

Write down the 65th percentile

• 21 kmh^-1

• 20 kmh^-1

• 30 kmh^-1

• 15 kmh^-1