If a randomly selected orphaned pet in a St. Louis animal shelter is a dog of one the types shown in the table, what is the probability that it is a mastiff?

City Cat Dog−Lhasa Apso Dog−Mastiff Dog−Chihuahua Dog−Collie
Austin 24.5% 2.76% 2.86% 3.44% 2.65%
Baltimore 19.9% 3.37% 3.22% 3.31% 2.85%
Charlotte 33.7% 3.25% 3.17% 2.89% 3.33%
St. Louis 43.8% 2.65% 2.46% 3.67% 2.91%
Salt Lake City 28.9% 2.85% 2.78% 2.96% 2.46%
Orlando 37.6% 3.33% 3.41% 3.45% 2.78%
Total 22.9% 2.91% 2.68% 3.09% 2.58%
A.
26.65%
B.
15.30%
C.
18.15%
D.
21.04%

Question

If a randomly selected orphaned pet in a St. Louis animal shelter is a dog of one the types shown in the table, what is the probability that it is a mastiff?

City	Cat	Dog−Lhasa Apso	Dog−Mastiff	Dog−Chihuahua	Dog−Collie
Austin	24.5%	2.76%	2.86%	3.44%	2.65%
Baltimore	19.9%	3.37%	3.22%	3.31%	2.85%
Charlotte	33.7%	3.25%	3.17%	2.89%	3.33%
St. Louis	43.8%	2.65%	2.46%	3.67%	2.91%
Salt Lake City	28.9%	2.85%	2.78%	2.96%	2.46%
Orlando	37.6%	3.33%	3.41%	3.45%	2.78%
Total	22.9%	2.91%	2.68%	3.09%	2.58%
A. 
26.65%
B. 
15.30%
C. 
18.15%
D. 
21.04%

Mercury · Answer

the table is a bit hard to read, but since it wants the probability of a Mastiff from all of the St. Louis dogs, simply add up all the percentages in the St. Louis row, then divide

(St. Lous Mastiff %) / (total St. Louis %)