![Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products](https://m.media-amazon.com/images/I/71mCfR49bYL._AC_UF894,1000_QL80_.jpg)
Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
![Hi guys! Half a year ago I bought a new casio fx-991ex. Recently 3 keys stopped working (optn, calc, left) though the cursor is blinking. I haven't spilled water over it nor Hi guys! Half a year ago I bought a new casio fx-991ex. Recently 3 keys stopped working (optn, calc, left) though the cursor is blinking. I haven't spilled water over it nor](https://external-preview.redd.it/SH6Zb9aQg2VHaPfeF6LT9C10IPC_Fi7y_LtVPbHvFFY.png?format=pjpg&auto=webp&s=52445826fdfe0a805eff7f84a1c84d303e6b4efc)
Hi guys! Half a year ago I bought a new casio fx-991ex. Recently 3 keys stopped working (optn, calc, left) though the cursor is blinking. I haven't spilled water over it nor
Calculadora Científica Original Casio FX-991EX 991ES Plus 82MS Nueva Edición 240 Funciones 2a Adecuada Para Uso Profesional Por Estudiantes | Shopee México
![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 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](https://preview.redd.it/trying-to-calculate-the-first-and-third-quartile-with-my-v0-csddtepsntw91.jpg?auto=webp&s=9f27fa3fdd86bf662b8bb8bea9d0d4110b379091)
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
![Estuche rígido para calculadora científica Casio FX 991EX / FX 991DE y más (solo estuche)|Accesorios de altavoces| - AliExpress Estuche rígido para calculadora científica Casio FX 991EX / FX 991DE y más (solo estuche)|Accesorios de altavoces| - AliExpress](https://ae01.alicdn.com/kf/HTB1Ox.XR3TqK1RjSZPhq6xfOFXa9/Estuche-r-gido-para-calculadora-cient-fica-Casio-FX-991EX-FX-991DE-y-m-s-solo.jpg_Q90.jpg_.webp)
Estuche rígido para calculadora científica Casio FX 991EX / FX 991DE y más (solo estuche)|Accesorios de altavoces| - AliExpress
![Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products](https://m.media-amazon.com/images/I/71e6EfW23DL._AC_UF894,1000_QL80_.jpg)
Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products
CALCULADORA CIENTIFICA CASIO FX-991EX DE 552 FUNCIONES-CASIO/Casio/ Calculadoras/Insumos de oficina|Tienda en méxico
![Amazon.com : CASIO FX-991EX Advanced Engineering/Scientific Calculator (UK Version), Black : Office Products Amazon.com : CASIO FX-991EX Advanced Engineering/Scientific Calculator (UK Version), Black : Office Products](https://m.media-amazon.com/images/I/71Xm9hKeUhL.jpg)