SOLUTION: A certain company's IT department has found that 18% of all visitors to the company website arrive there in error. (They are actually looking for another website.) If this percenta

Algebra ->  Probability-and-statistics -> SOLUTION: A certain company's IT department has found that 18% of all visitors to the company website arrive there in error. (They are actually looking for another website.) If this percenta      Log On


   

Question 1096487: A certain company's IT department has found that 18% of all visitors to the company website arrive there in error. (They are actually looking for another website.) If this percentage is correct, what is the probability that, in a random sample of 7 visitors to the website, exactly 2 arrive in error?
Round your answer to three decimal places.
Answer by greenestamps(13203) About Me  (Show Source):
You can put this solution on YOUR website!

expansion using the binomial formula....

The probability that the visitor arrived on the website in error is 0.18; so the probability that they intended to reach the website is 0.82.

Then the probability that 2 out of 7 visitors reached the website in error is
C%287%2C2%29%2A%280.18%5E2%29%2A%280.82%5E5%29

You can do the calculation....