According to Apple’s iTunes App Store, 630,210 active applications (apps) were available for download as of May 1, 2012. Below is a table showing monthly submissions of new applications to the App Store from March 2011 through April 2012. Determine the inter-quartile range for the submissions data.

MonthSubmitted Apps

2011–03........19,853

2011–04........20,025

2011–05........18,259

2011–06........20,249

2011–07........18,031

2011–08........20,687

2011–09........20,177

2011–10........20,221

2011–11........19,229

2011–12........21,691

2012–01........21,082

2012–02........19,622

2012–03........23,245

2012–04........22,795