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 

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