# Empirical rule

Practice applying the 68-95-99.7 empirical rule.
You might need: Calculator

### Problem

The lifespans of lions in a particular zoo are normally distributed. The average lion lives 10 years; the standard deviation is 1, point, 4 years.
Use the empirical rule left parenthesis, 68, minus, 95, minus, 99, point, 7, percent, right parenthesis to estimate the probability of a lion living longer than 7, point, 2 years.
percent