The formula we use for standard deviation depends on whether the data is being considered a population of its own, or the data is a sample representing a larger population.

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.

The formula we use for standard deviation depends on whether the data is being considered a population of its own, or the data is a sample representing a larger population.

What is the average age of the bears at your zoo? What is the standard deviation? Round your answers to the nearest tenth.

In a binomial distribution, the first formula you wrote is the standard deviation of the number of successes, while the second formula you wrote is the standard deviation of the sample …

Practice calculating sample standard deviationOops. Something went wrong. Please try again. Uh oh, it looks like we ran into an error. You need to refresh. If this ...

Sal shows an example of calculating standard deviation and bias. Created by Sal Khan.

For a binomal random variable, the mean is n times p (np), where n is the sample size and p is the probability of success. The standard deviation is the square root of np (1-p).

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.

Practice calculating the mean and standard deviation for the sampling distribution of a sample proportion.