SOLUTION: In a survey at a local college, 17% of students reported that they do not own a mobile device with internet capabilities. If 20 students are selected at random, find the variance o

Algebra ->  Probability-and-statistics -> SOLUTION: In a survey at a local college, 17% of students reported that they do not own a mobile device with internet capabilities. If 20 students are selected at random, find the variance o      Log On


   

Question 1099499: In a survey at a local college, 17% of students reported that they do not own a mobile device with internet capabilities. If 20 students are selected at random, find the variance of the number of students that don't own a mobile device with internet capabilities.

7.8

2.8

1.7

3.4
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
n = sample size = 20
p = probability of selecting someone who does not own a mobile device with internet capabilities = 0.17
Variance of Binomial Distribution = n*p*(1-p)
Variance of Binomial Distribution = 20*0.17*(1-0.17)
Variance of Binomial Distribution = 2.822
Variance of Binomial Distribution = 2.8