The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 15 - Sampling Distributions - Chapter 15 Exercises - Page 369: 15.29a

Answer

The probability that Shelia is diagnosed as needing further testing for gestational diabetes is 0.25

Work Step by Step

Here we have μ = 122, x = 130, σ = 12 We need to calculate z score for the probability: $z = \frac{x - μ}{σ} = \frac{130-122}{12} = 0.67$ Using Table A of the book, we have: P(z > 0.67) = 0.2514
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