Answer
The probability of part b) should be used.
Work Step by Step
We should use the probability of part b), because this tells us the probability that the number will be at least $428$.
This allows us to see whether $428$ is large or small.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 5 - Discrete Probability Distributions - Review Exercises - From Data To Decision - Page 241: c
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