Calculating standard deviation step by step - Khan Academy The standard deviation formula may look confusing, but it will make sense after we break it down In the coming sections, we'll walk through a step-by-step interactive example
Concept check: Standard deviation (article) | Khan Academy Introduction The questions below are designed to help you think deeply about standard deviation and its formula Unlike most questions on Khan Academy, some of these questions aren't graded by a computer You'll learn the most if you try answering each question yourself before clicking "explain"
Variance and standard deviation of a discrete random variable We learn how to calculate the mean and standard deviation of a discrete random variable The concept of a random variable is explained, along with methods to calculate its expected value (mean) and measure its spread (variance and standard deviation)
Measures of spread: range, variance standard deviation The range is easy to calculate—it's the difference between the largest and smallest data points in a set Standard deviation is the square root of the variance Standard deviation is a measure of how spread out the data is from its mean Created by Sal Khan