Maths - Statistics
Splash Maths - These are free but have upgrades available for purchase, free version allows 10 questions per day. There are a number of apps in this series for different grades and they cover a range of maths areas including Statistics Grade 1, Grade 2, Grade 3, Grade 5
GeoGebra - free graphing calculator -mostly suited to ages 8+.
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Google Sheets - add data to the spreadsheet then create graphs
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