does it do mean and standard deviation?

The answer to this question is perhaps. The problem is the instruction booklet does not go with the calculator. Keys mentioned in the booklet are not present on the actual calculator and that includes buttons necessary for mean and SD calculations. I have spent a lot of time on this calculator and so far have not been bale to get mean or SD. The Chinese manufacturers need to produce an instruction booklet that refers to the particular calculator in question. As it is I cannot recommend this calculator.

How do you change it to radian mode?

Press the key Mode/clr key several times until DEG RAD GRA appears. Then press the number under the word RAD.

I have a function question. if i want to square root 9, do i input 9 1st, or do i select the square root function 1st?

Select the square root function first.

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Helect 2-Line Engineering Scientific Calculator, Suitable for School and Business (Black)

Helect 2-Line Engineering Scientific Calculator, Suitable for School and Business (Black)

Product ID: 44215738

Details

Brand
Helect
Calculator Type
Color
Black
Power Source
Battery
Screen Size
6.3

📊240 scientific functions

🔒Solid sliding protective case

🖥️12-digit widescreen HD display

€ 38.68

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Description

📈 Elevate your calculations, impress your peers — never miss a beat with Helect!

ERGONOMIC PRECISION - Comfort-grip design with responsive buttons ensures error-free, efficient use all day long.
VERSATILE ANGLE MODES - Switch seamlessly between degrees, radians, and grads for every engineering or business need.
DURABLE TRAVEL READY - Protective sliding case guards your calculator from scratches and bumps on the go.
DUAL LINE DISPLAY CLARITY - See your input and results simultaneously on a crisp 12-digit widescreen HD display.
MASTER COMPLEX CALCULATIONS - 240 advanced scientific functions to power through any problem with ease.

The Helect 2-Line Engineering Scientific Calculator is a professional-grade tool featuring 240 scientific functions, a 12-digit dual-line HD display, and ergonomic design. Ideal for students and business professionals, it supports multiple angle modes and statistical calculations, all protected by a durable sliding case for reliable performance anywhere.

Specifications

ASIN	B01MCQMORK
Best Sellers Rank	#40,284 in Office Products ( See Top 100 in Office Products ) #36 in Scientific Calculators
Brand	Helect
Calculator Type	Engineering/Scientific
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (21,447)
Display Type	LCD
Enclosure Material	Plastic
Item Dimensions L x W	0.63"L x 0.33"W
Item Weight	180 Grams
Manufacturer	Helect
Mfr Part Number	H-1002-
Model Number	H-1002-
Power Source	Battery Powered
Screen Size	6.3 Centimeters

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€ 38.68

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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