At CMC Steel a large batch of ½ inch rebar

Question

 At CMC Steel a large batch of ½ inch rebar was inspected for defects. Within a batch of 10,000 rebar made, 500 were selected at random and tested. If 10 were found to have inclusions in the sample, how many defective rebar would be expected in the entire bunch?

Answer 1

Given this information, we can compute the percentage of defects in the sample, and then multiply that number times the batch size.

 

So, 10 units ÷ 500 units = 0.02

 

that decimal times the batch size gives us 0.02 x 10,000 = 200 defects