Question: Refer to the data on number of returns in Example 4. (a) Calculate and s. (b) Find the proportions of the observations that are

Refer to the data on number of returns in Example 4.
(a) Calculate and s.
(b) Find the proportions of the observations that are in the intervals ± s, ± 2s, and ± 3s.
(c) Compare the results of part (b) with the empirical guidelines.

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