The lifespans of gorillas in a particular zoo are normally distributed. The average gorilla lives
20.8
20.820, point, 8 years; the standard deviation is
3.1
3.13, point, 1 years.
Use the empirical rule
(
68
−
95
−
99.7
%
)
(68−95−99.7%)left parenthesis, 68, minus, 95, minus, 99, point, 7, percent, right parenthesis to estimate the probability of a gorilla living between
11.5
11.511, point, 5 and
27
2727 years.