Question: please show step by step how to solve these questions. Not through excel please. A stock had returns of 18.03 percent, -5.25 percent, 20.48 percent,
please show step by step how to solve these questions. Not through excel please.

A stock had returns of 18.03 percent, -5.25 percent, 20.48 percent, and 8.67 percent for the past four years. What is the variance of the returns
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