Question

a company has 200 employees the company's owner randomly chose 30 employees for an in-depth survey. of those surveyed 12 employees said they work overtime on a regular basis.

what is the best estimation of the percent of all the companys employees who work overtime on a regular basis

Answer 1

30 is a sample taken randomly from the 200 people, so we can apply the same ratio. (...just in this context, not all companies are the same)
12/30 = 40%.
40% of all employees work overtime.

Answer 2

so answer is 40%?

Answer 3

Yea.