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A firm has the following annual returns for the last five years: 20% 17% 19% -40% 18% Please calculate the SD and the Mean of

A firm has the following annual returns for the last five years:

20%
17%
19%
-40%
18%

Please calculate the SD and the Mean of the firm for the period in question; in addition, what is the range of values that would fall within:

68% of the time
99% of the time
95% of the time

Answer: M: 6.8; SD: 26.18

-19.38 to 32.98
-71.74 to 85.34
45.56 to 59.16

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