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

📊2-variable statistical calculations

📐3 angle modes (deg, rad, grad)

🔢240 scientific functions

185 Lei

Duties & taxes included

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Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📈 Elevate your calculations—because precision is the new power move!

COMPACT YET MIGHTY - Lightweight and portable design fits seamlessly into your busy lifestyle without compromising performance.
DUAL LINE DISPLAY MASTERY - Simultaneously view inputs and results on a crisp 12-digit widescreen HD display for flawless workflow.
DURABLE SLEEK PROTECTION - Solid sliding case guards your calculator from daily wear, keeping it pristine and professional.
PRECISION AT YOUR FINGERTIPS - Responsive, ergonomic buttons with clear, scratch-proof numbers ensure error-free calculations every time.
VERSATILE SCIENTIFIC POWERHOUSE - Handles complex engineering and statistical functions effortlessly, perfect for school and business alike.

The Helect 2-Line Engineering Scientific Calculator offers 240 advanced scientific functions, a dual-line 12-digit HD display, and three angle modes, making it ideal for both academic and professional use. Its ergonomic design, responsive buttons, and durable sliding case combine to deliver reliable, precise calculations in a sleek, portable package.

Specifications

ASIN	B01MCQMORK
Best Sellers Rank	#26,469 in Office Products ( See Top 100 in Office Products ) #56 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 (21,542)
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-
Power Source	Battery Powered
Screen Size	6.3 centimeters
Unit Count	1 Count

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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185 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered 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 Romania.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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