At a convention there are 7 math instructors, 5 computer science instructors, 3 statistics instructors and 4 science instructors. If an instructor is selected at random, what is the probability of selecting a math or science instructor?

1 Answer
Alan P.
Feb 8, 2016

#P("math"|"science instructor") = 11/19#

Explanation:

There are a total of #7+5+3+4= 19# instructors.
of these
there are #7+4=11# who teach either math or science.

Therefore #11/19# of the instructors teach either math or science.

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