SOLUTION: Approximately 80% of American households have a computer. 9 households are randomly selected. a) What is the probability at least 6 households have a computer? b) What is th

Algebra ->  Permutations -> SOLUTION: Approximately 80% of American households have a computer. 9 households are randomly selected. a) What is the probability at least 6 households have a computer? b) What is th      Log On


   

Question 613650: Approximately 80% of American households have a computer. 9 households are randomly selected.
a) What is the probability at least 6 households have a computer?

b) What is the probability at most 3 households have a computer?

A stockbroker gains 3 new accounts, on average, in a week’s time. What is the probability that he gains 15 new accounts in the next 4 weeks?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Approximately 80% of American households have a computer.  9 households are randomly selected.

Using Stattrek.com Binomial Calculator

P(at least 6) = .9144

P(at most 3) = .0031

A stockbroker gains 3 new accounts, on average, in a week’s time. 

What is the probability that he gains 15 new accounts in the next 4 weeks

Using Stattrek.com Poison Probablity Calculator

 P(15;12) = .0724