### How To Calculate Standard Deviation

Watch more Intermediate Math Skills videos: http://www.howcast.com/guides/65-Intermediate-Math-Skills Subscribe to Howcast's YouTube Channel - http://howc.st/uLaHRS Follow these steps to learn how to calculate standard deviation. Howcast uploads the highest quality how-to videos daily! Be sure to check out our playlists for guides that interest you: http://howc.st/ytmainplaylists Subscribe to Howcast's other YouTube Channels: Howcast Health Channel - http://howc.st/HOE3aY Howcast Video Games Channel - http://howc.st/tYKKrk Howcast Tech Channel - http://howc.st/rx9FwR Howcast Food Channel - http://howc.st/umBoJX Howcast Arts & Recreation Channel - http://howc.st/vmB86i Howcast Sports & Fitness Channel - http://howc.st/vKjUjm Howcast Personal Care & Style Channel - http://howc.st/vbbNt3 Howcast empowers people with engaging, useful how-to information wherever, whenever they need to know how. Emphasizing high-quality instructional videos, Howcast brings you experts who provide accurate information in easy-to-follow tutorials on everything from makeup, hairstyling, nail art design, and soccer to parkour, skateboarding, dancing, kissing, and much, much more. Step 1: Collect your data Collect your data to create the data set from which you wish to calculate the standard deviation. Step 2: Calculate the mean of the data set Calculate the average, or mean, of the data set by adding all of the numbers of the set and dividing the total by the number of items in your set. Tip Calculate the mean of a set consisting of two, five, six, and seven by adding two plus five plus six plus seven, and then dividing by four -- the number of items in your set. The mean is five. Step 3: Subtract the mean from each number; square result Subtract the mean from the first number in your data set, and square the differences. Continue with each number in your data set. Tip With the set consisting of two, five, six, and seven, calculate two minus five and get negative three. Square that for a total of nine. Continue with the other numbers in the set. Step 4: Add squares together; divide by number of items Find the mean of the differences. Add the squared differences and then divide the total by the number of items in data in your set. Step 5: Take the square root to find standard deviation Take the square root of this mean of differences to find the standard deviation. Did You Know? The term "standard deviation" was first used by statistician Karl Pearson in 1893.

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