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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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

📊1 & 2 variable stats

🔢240 scientific functions

🖥️12-digit widescreen HD display

S/.94

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Description

🧮 Elevate your calculations—because precision is the new power move.

VERSATILE ANGLE MODES - Switch seamlessly between degrees, radians, and grads for precision in every project.
PROTECTIVE SLIDING CASE - Shield your calculator from scratches and bumps—carry confidence everywhere.
DUAL LINE DISPLAY MASTERY - See your input and result simultaneously—no more guesswork.
ERGONOMIC DURABLE DESIGN - Comfort grip with responsive buttons and a scratch-proof surface for daily hustle.
240 FUNCTIONS AT YOUR FINGERTIPS - From engineering to statistics, conquer complex calculations effortlessly.

The Helect 2-Line Engineering Scientific Calculator is a professional-grade tool featuring 240 scientific functions, a 12-digit widescreen HD dual-line display, and versatile angle modes. Designed for both school and business, it offers ergonomic comfort, responsive buttons, and a durable sliding protective case, powered by a single CR2025 battery for reliable performance.

Specifications

ASIN	B01MCQMORK
Best Sellers Rank	#8,222 in Office Products ( See Top 100 in Office Products ) #27 in Scientific Calculators
Brand	Helect
Calculator Type	Engineering/Scientific
Color	Black
Compatible Devices	Single Use
Customer Reviews	4.4 4.4 out of 5 stars (21,637)
Display Type	LCD
Enclosure Material	Plastic
Item Dimensions L x W	0.63"L x 0.33"W
Item Weight	6.72 ounces
Manufacturer	Helect
Mfr Part Number	H-1002-
Model Name	H1002
Model Number	H-1002-
Number of Items	1
Power Source	Battery Powered
Screen Size	6.3 centimeters
Unit Count	1 Count

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S/.94

Duties & taxes included

In stock

Sold byAmazon PeruDelivered 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 Peru.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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