Answer
P(exactly four will travel towards pheromone) = 5C4 x 0.5^{4} x 0.5^{1}
= 0.156
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 - Supplementary Exercises 3.154 - 3.199 - Applying the Concepts - Basic - Page 172: 3.174c
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