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)

Product ID: 44215738

Details

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

📊2-variable statistical calculations

🔢240 scientific functions

🖥️12-digit 2-line widescreen HD display

21137CFA

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Description

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

ERGONOMIC PRECISION - Comfort grip and responsive buttons keep you focused, not fumbling.
VERSATILE ANGLE MODES - Switch seamlessly between degrees, radians, and grads to suit any project.
DUAL LINE DISPLAY MASTERY - Simultaneously view equations and results for flawless workflow.
DURABLE SLEEK PROTECTION - Sliding case shields your calculator from daily wear and tear in style.
240 FUNCTIONS AT YOUR FINGERTIPS - From engineering to statistics, conquer complex calculations effortlessly.

The Helect 2-Line Engineering Scientific Calculator offers 240 advanced scientific functions with a crisp 12-digit, 2-line HD display that shows both input and output simultaneously. Designed for professionals and students alike, it supports multi-variable statistics and three angle modes, all housed in an ergonomic, durable body with a protective sliding case. Powered by a single CR2025 battery, it’s a reliable, stylish tool for school, business, and engineering tasks.

Specifications

ASIN	B01MCQMORK
Best Sellers Rank	#44,870 in Office Products ( See Top 100 in Office Products ) #41 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 (21,884)
Display Type	LCD
Enclosure Material	Plastic
Item Dimensions L x W	0.63"L x 0.33"W
Item Weight	180 g
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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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21137CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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3 days ago

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