Standard deviation of this stock

Question

Problem:

A stock had returns of 5 percent, -3 percent, 2 percent, and 14 percent over the past 4 years.

Required:

Question: What is the standard deviation of this stock for the past four years?

• 12.4 percent
• 3.6 percent
• 4.5 percent
• 7.1 percent

Note: Please explain comprehensively and give step by step solution.