Loona Calculators
A complete statistics summary from a single list of numbers: central values, spread, variance and standard deviation — for students, teachers, researchers and everyday data work.
Use population when your numbers are the complete set you care about. Use sample when your numbers are drawn from a larger group — it divides by (count − 1) instead of count to correct the estimate.
How spread out the numbers are around the mean. A small standard deviation means the values cluster tightly; a large one means they are widely scattered.
The average of the squared differences from the mean. Standard deviation is simply its square root, which brings the measure back into the original units.