Answer to Question #189509 in Statistics and Probability for Azrin

Question

What is the probability that 9 package recipients are unemployed

Answer 1

Probability of unemployed people p = 0.11

Then $q=1-p=1-0.11=0.89$

$n=10$

Probability that 9 package recipients are unemployed $= ^{10}C_9p^9q^1$

$=10\times (0.11)^9(0.89)^1=0.00002098$