其它
\textbf{Scientists estimate that the distribution of the life span of the Galápagos Islands giant tortoise is approximately normal with mean 100 years and standard deviation 15 years. Based on the estimate, which of the following is closest to the age of a Galápagos Islands giant tortoise at the 90th percentile of the distribution?} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{P(X\textgreater x) = 0.9~}  \textbf{P(Z\textgreater$$\frac{x-100}{15}$$) = 0.9}  \textbf{$$\frac{x-100}{15}$$ = 1.29}  \textbf{X = 119.35} 