Question

A worker takes a random sample of 200 bolts and finds that 30 of them are either too long or too short, thus making them unusable. Estimate the number of unusable bolts in a production of 17,000 bolts.

Answer 1

\(\Large \color{purple}{\rightarrow 30:200::x:17000 }\)
\(\Large \color{purple}{\rightarrow 200x = 510000 }\)
\(\Large \color{purple}{\rightarrow 2x = 5100 }\)
\(\Large \color{purple}{\rightarrow x = 2050 }\)

He/she makes 2050 bolts unusable