Answer
292 dollars
Work Step by Step
$P(x \geq 250 ) = 0.20$
From Table IV, this value of z= 0.84
Z = $ \frac{x- μ }{ σ }$
50*0.84= -250 + μ
μ = 292 dollars
Introductory Statistics 9th Edition
by Mann, Prem S.
Published by
Wiley
ISBN 10:
1-11905-571-7
ISBN 13:
978-1-11905-571-6
Chapter 6 - Section 6.4 - Determining the z and x Values When an Area Under the Normal Distribution Curve Is Known - Exercises - Page 256: 6.43
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