According to a Department of Labor report,the city of Detroit had a 20% unemployment rate in May of 2011.Eight working-age residents were chosen at random.What is the probability that exactly four residents were unemployed?
A) 0.0013
B) 0.0091
C) 0.0459
D) 0.1468

Question

Quizplus · Accepted Answer

The situation can be modeled by a binomial distribution with n=8 and p=0.20 (probability of unemployment). The probability of exactly 4 residents being unemployed is given by: ${8 \choose 4} (0.20)^4 (1-0.20)^4 \approx 0.0459$

According to a Department of Labor Report,the City of Detroit