Help Please Binomial Probability Distribution

[sgtshep]

Help Please Binomial Probability Distribution

I am given this problem


72% of americans have online access

Out of a sample of 30 people


what is the expected number of persons with online acess?

 

[elnaz]

hello
n=30
p=.72
X~bin(n,p) => E(X)=n*p => the expected number of persons with online acess : E(X)=30*.72 =21.6