Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 7 - Review - Review Exercises - Page 394: 10d

Answer

60,980 miles

Work Step by Step

2% = 0.02 According to Table V, the z-score which gives the closest value to 0.02 is -2.05 Let's find the mileage for the given z-score: $z=\frac{X-μ}{σ}$ $-2.05=\frac{X-70000}{4400}$ $-2.05\times4400=X-70000$ $-9020=X-70000$ $X=-9020+70000$ $X=60980$
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