Question 1

What is standard deviation?

Accepted Answer

Measures data spread from the mean. Low SD = data clustered. High SD = data spread out. SD of 68,95,99.7% rule.

Question 2

How do I calculate standard deviation?

Accepted Answer

Find mean, subtract mean from each value, square differences, average them, take square root. Use calculator for accuracy.

Question 3

How accurate are these calculations?

Accepted Answer

Our calculator uses double-precision floating-point arithmetic, accurate to about 15-16 significant digits for most calculations.

Question 4

Can I use the result in further calculations?

Accepted Answer

Yes, results are calculated to full precision. You can copy the exact value or use the rounded display depending on your needs.

Standard Deviation Calculator

Frequently Asked Questions