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

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)=$\frac{7+4}{19}=\frac{11}{19}$

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