Los Gatos negros means the black cats so from your options that should help
There are many cities in the U.S. that have Spanish names like San Jose, San Antonio, El Paso, etc. Hope this helps!
Americano would be the correct one
Estbamos because you guys were in the beach.
Hope I have helped.
To answer your question, The standard deviation is a measure of the spread of scores within a set of data.
And example of this is in the picture below.
Hope this helps!!