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  2. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.

  3. How Is the Rule of 85 Applied to Retirement? - AOL

    www.aol.com/finance/rule-85-applied-retirement...

    Continue reading → The post How Is the Rule of 85 Applied to Retirement? appeared first on SmartAsset Blog. In place of a 401(k) plan, your employer may offer a defined benefit pension plan for ...

  4. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    This "Rule of 70" gives accurate doubling times to within 10% for growth rates less than 25% and within 20% for rates less than 60%. Larger growth rates result in the rule underestimating the doubling time by a larger margin. Some doubling times calculated with this formula are shown in this table. Simple doubling time formula:

  5. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    For example, if the interest rate is 18%, the rule of 69.3 gives t = 3.85 years, which the E-M rule multiplies by (i.e. 200/ (200−18)) to give a doubling time of 4.23 years. As the actual doubling time at this rate is 4.19 years, the E-M rule thus gives a closer approximation than the rule of 72.

  6. Rule of 78s - Wikipedia

    en.wikipedia.org/wiki/Rule_of_78s

    The formula contained in this law, which determined the amount due to lenders, was called the "rule of 78" method. The reasoning behind this rule was as follows: A loan of $3000 can be broken into three $1000 payments, and a total interest of $60 into six. During the first month of the loan, the borrower has use of all three $1000 (3/3) amounts.

  7. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The Doomsday rule, ... Mathematical formula 5 × (c mod 4) mod 7 + Tuesday = anchor. Algorithmic Let r = c mod 4 ... a is the floor of ⁠ 85 / 12 ...

  8. Rule of three (statistics) - Wikipedia

    en.wikipedia.org/wiki/Rule_of_three_(statistics)

    The rule can then be derived [2] either from the Poisson approximation to the binomial distribution, or from the formula (1−p) n for the probability of zero events in the binomial distribution. In the latter case, the edge of the confidence interval is given by Pr( X = 0) = 0.05 and hence (1− p ) n = .05 so n ln (1– p ) = ln .05 ≈ −2.996.

  9. Trouton's rule - Wikipedia

    en.wikipedia.org/wiki/Trouton's_rule

    In thermodynamics, Trouton's rule states that the (molar) entropy of vaporization is almost the same value, about 85–88 J/(K·mol), for various kinds of liquids at their boiling points. [1] The entropy of vaporization is defined as the ratio between the enthalpy of vaporization and the boiling temperature.