e></li>
      <li>Estimate total return of an investment account. Both the interest rate and length of investing is unsure. For example: <code>5000 x (-2~5 / 100) x 5~10</code></li>
      <li>Estimate the probability of dying in a pandemic, given an uncertain morbidity rate (how many people get sick) and mortality rate (how many infected people die). For example: <code>(10~30 / 100) * (0.1~1.0 / 100) * 100</code></li>
      <li>Estimate the height of a skyscraper, given an uncertain distance from its base, 