Answer
a)-0.39
b) A bet on number 27.
Work Step by Step
a)The expected value is: $30\cdot \frac{5}{38}+(-5)\cdot\frac{33}{38}=-0.39$
b)The expected number of betting on number 27 is more than betting on the 5 numbers, therefore it is better.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 5 - Discrete Probability Distributions - 5-2 Probability Distributions - Page 210: 25
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