Bavant Needs to Gather Some Additional Statistics on Its Customers

question 4

Short Answer

Bavant needs to gather some additional statistics on its customers. An employee at Bavant has created an initial query as shown in the acsampanying figure that calculates the average amount paid. The employee is unsure what aggregate functions to use for additional calculations.
Which aggregate function will find the standard deviation?

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Definitions:

Coal

A combustible black or brownish-black sedimentary rock used primarily as a fuel in electricity generation.

Nuclear Energy

Energy released during nuclear fission or fusion, especially when used to generate electricity.

Electricity

A form of energy resulting from the existence of charged particles such as electrons or protons, characterized by its ability to perform work, such as powering electrical devices.