Question

Out of 1,100 discs tested, 13 are defective. Estimate the number of defective discs in a batch of 41,000

Answer 1

you can use ratio and proportions
\[\huge \implies \frac{1,100}{13} = \frac{41,000}x\]
solve for x

Answer 2

does that help?

Answer 3

not yet ? please make me clear

Answer 4

solve for x....what don't you get?

Answer 5

Are you familiar with hypergeometric distributions?