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Answer:
Sigma is the 18th letter of the Greek alphabet and is equivalent to our letter 'S'. In mathematics, the upper case sigma is used for the summation notation. The lower case sigma stands for standard deviation. If you notice, the two formulas that use these two symbols both start with the letter 's'.
Answer:
In the field of math, the word 'sigma' either means summation or standard deviation.
Explanation:
