Answer
P(No crystal) = 1 - P(crystal)
= 1 - 0.1 = 0.9
If repeated 7 times
P(No crystal)^{7} = (0.9)^{7}
= 0.478
P(at least 1 crystal) = 1 - P(no crystal)^{7}
= 1 - 0.478 = .522
Work Step by Step
As given in answer
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 3 - Probability - Exercises 3.63 - 3.97 - Applying the Concepts - Advanced - Page 149: 3.95b
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