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

📊1 & 2 variable stats

📐3 angle modes

🔢240 scientific functions

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$34.23

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Description

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

DURABLE SLIDING CASE - Protect your investment with a scratch-proof, dual-sided cover.
ERGONOMIC PRECISION GRIP - Designed for comfort during marathon study or work sessions.
DUAL LINE DISPLAY MASTERY - See your input and result simultaneously for zero errors.
240 FUNCTIONS AT YOUR FINGERTIPS - From complex stats to engineering notation, handle it all effortlessly.
CRYSTAL CLEAR 12 DIGIT HD SCREEN - Wide, sharp display ensures no detail is missed.

The Helect 2-Line Engineering Scientific Calculator offers 240 advanced scientific functions, including statistical calculations and three angle modes, displayed on a crisp 12-digit widescreen LCD. Its ergonomic design and responsive buttons ensure comfortable, error-free use, while a durable sliding protective case safeguards the device. Ideal for students and professionals seeking reliable, high-performance calculation tools.

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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