please answer those two questions

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A stock you are looking at has generated the following annual returns: 10.0%, -5.0% and 4.0%. What was the standard deviation of its returns? Answer in percent, rounded to two decimal places (e.g., 4.32% = 4.32). Numeric Answer: A stock has generated an annual average return of 8.0% with a standard deviation of 45.0% during the last 10 years. If the average risk-free rate was 1.6%, what was this stock's Sharpe Ratio? Round to two decimal places. Numeric