Prealgebra (7th Edition)

$\frac{5}{13}$
To determine what fraction of the USMC training facilities are in California you must first find the total number of facilities. $5+3+2+1+1+1=13$ A fraction represents $\frac{part}{whole}$, so if 5 facilities are in Califonia, the fraction is $\frac{5}{13}$.