**A**:

- [3.7%, 14.5%] lie with +/- 2 standard deviations of the mean
- (15.1-9.1)/3 = 2
- (9.1-3.1)/3 = 2

- From Chebyshev's Inequality: 1-1/k^2 = 1-1/2^2 = 75%

*Bonus Points*

- It applies to both populations and samples, and for discrete and continuous data, regardless of the shape of the distribution.
- Empirical Rule only applies to normal distributions. It states 68% within 1s, 95% within 2s, and 99% within 3s.

- Gives a conservative estimate of the proportion of observations in an interval about the mean.
- Assume the return is normal, Empirical rule gives 95% > 75%.

*Category: Quantitative Analysis > Probability*

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