Help please! thanks

Pregunta 40 Sin responder ain Returns for the Dayton Company over the last 3 years are shown below. What's the standard deviation of the firm's retums? (Hint: This is a sample, not a complete population, to the sample standard deviation formula should be used.) Do not round your intermediate calculations Punta como 1,00 Year Marca: pregunta Return 210096 2013 2012 2011 12.50% 35.00% a 34,4194 b. 30.02% CC 23:43 d. 27.09 Ore 18.799