Answer
$\frac{11}{19}$
Work Step by Step
There is a total of 19 instructors,
and the probability of getting a science instructor or a math instructor is
P(science or math)=$\frac{7+4}{19}=\frac{11}{19}$
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 4 - Probability and Counting Rules - 4-2 The Addition Rules for Probability - Exercises 4-2 - Page 207: 9
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