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Sigma notation, often referred to as summation notation, can be used in many common situations. For example, it can be used to calculate the sum of deposits for a bank account. Banks add together all deposits and withdrawals to determine the current balance.
The first and most common formula related to the sigma symbol is the summation notation using the upper case sigma. The less common formula is the one for standard deviation used in statistics. This second formula uses the lower case sigma. To unlock this lesson you must be a Study.com Member.