Does this calculator support dual mode(have backup battery)?

I'm looking for a "solar only" (no auto-shutoff) calculator, but the description on this one says "2 AA batteries required." -- maybe seller can answer?

what are the dimensions in inches?

I use these for my Compassion Boxes (Samaritans Purse), have them already packed up, but I can assure you they are a just right size maybe approximately 3 x 5". Very solid and solar is why I buy them, so they don't need continual batteries, which these children do not have access to. That is the best I can do for you! I just noticed it says 3" x 5" 2.25 (FX-260 SolarII-SIH) This should answer your question for sure!

Does this have statistical functions?

It has the basic stats functions, such as sample and population average, standard deviation, etc. It's been decades since I studied stats, but the FX-260 SolarII has the basics stats functions, yes.

ASIN	B071R3H9WB
Batteries	2 AA batteries required. (included)
Best Sellers Rank	#7,867 in Office Products ( See Top 100 in Office Products ) #16 in Scientific Calculators
Customer Reviews	4.6 4.6 out of 5 stars (5,651)
Date First Available	April 15, 2017
Department	Unisex-Adult
Is Discontinued By Manufacturer	No
Item Weight	0.317 ounces
Item model number	FX-260 SOLARII-S-IH
Manufacturer	Casio
Product Dimensions	4.78 x 2.77 x 0.35 inches

Casio fx-260 Solar II Scientific Calculator | 10-Digit Display | Fraction & Trig Functions | Ideal for Middle School, High School Math, Algebra, Trigonometry | Solar Powered

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