The CodeChef IDE lets you code right in your browser, making it easy to start practicing with their problem sets. Understanding time and memory limits is key; your code needs to be both fast and ...

A three sigma limit is a statistical calculation that refers to data within three standard deviations from a mean. It shows how much variation exists from an average.

The full data set from our in-depth investigation into mass shootings.

Variance is a measurement of the spread between numbers in a data set. Investors use the variance equation to evaluate a portfolio’s asset allocation.