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Empirical rule

The lifespans of lions in a particular zoo are normally distributed. The average lion lives 1010 years; the standard deviation is 1.41.4 years.
Use the empirical rule (68−95−99.7%)(68 - 95 - 99.7\%) to estimate the probability of a lion living longer than 7.27.2 years.
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
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