Answer
x=24
Work Step by Step
$μ=E(x)=∑xP(x)=0×0.2+1×0.2+2×0.2+3×0.2+x\times0.2%$
$6=1.2+0.2x$
$x=\frac{6-1.2}{0.2}=24$
Applied Statistics and Probability for Engineers, 6th Edition
by Montgomery, Douglas C.; Runger, George C.
Published by
Wiley
ISBN 10:
1118539710
ISBN 13:
978-1-11853-971-2
Chapter 3 - Section 3-4 - Mean and Variance of a Discrete Random Variable - Exercises - Page 77: 3-65
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