Answer
$P(X = -2) = P(X = -1) = .2$
Work Step by Step
Let $y = P(X = -2) = P(X = -1)$. Since the probabilities must sum up to 1, we have $y + y + .4 + .1 + .1 = 1$, i.e. $2y + .6 = .1$, so $2y = .4$ and $y = .2$.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 8 - Section 8.1 - Random Variables and Distributions - Exercises - Page 555: 20b
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