Casio Fx-991ex Scientific Calculator FX 991 ES Plus 2nd Edition

Redesigned ES PLUS series calculators featuring easy-to-understand Natural Textbook Display, Non-Programmable Scientific Calculator with 417

Casio fx-991ES Plus Scientific Calculator

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Casio fx-991ES PLUS Scientific Calculator

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Trying to calculate the first and third quartile with my casio fx-991EX but I'm not getting accurate results, any help? The correct quartiles are: Q1= 2.75 , Q3= 7.25 : r/calculators

Redesigned ES PLUS series calculators featuring easy-to-understand Natural Textbook Display, Non-Programmable Scientific Calculator with 417

Casio FX-991ES Plus 2nd Edition Scientific Calculator