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In the formula for a mean, what does the Greek capital letter sigma instruct you to do?
ATo multiply a specific list of numbers
BTo add up a specific list of numbers
CTo rank a specific list of numbers
DTo square a specific list of numbers
Answer & Solution
Correct answer: B. To add up a specific list of numbers
1. Sigma is a mathematical operator, in the same family as the plus and multiplication signs.
2. It instructs you to add up a specific list of numbers.
3. The index below it and the count above it say which items in the list to add.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.4 Sigma Notation and Calculating the Arithmetic Mean_
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