SOLUTION: a weld inspector in a shipyard knows that 5% of all welds done will be substandard. if he checks 300 out of 7500 welds completed, what is the probablility that he will find betwee

Algebra ->  Probability-and-statistics -> SOLUTION: a weld inspector in a shipyard knows that 5% of all welds done will be substandard. if he checks 300 out of 7500 welds completed, what is the probablility that he will find betwee      Log On


   

Question 203771: a weld inspector in a shipyard knows that 5% of all welds done will be substandard. if he checks 300 out of 7500 welds completed, what is the probablility that he will find between 10 and 20 substandard welds?
I know 5% of total 7500 welds yields 375 substandard welds, not sure how to figure.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
Use the sample for your calculations not the total.