Casio fx-991EX - Simple English Wikipedia, the free encyclopedia
Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" | DAGBO LIMITED INC
Black Casio 991EX Calculator
fx-991ES PLUS 2nd edition | Non programmable | scientific calculator | CASIO
Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
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