A manufacturer samples 100 wires for quality testing. Four of the wires are found to be defective. If 750 wires are produced in one hour, how many should the manufacturer expect to be defective?
a.30
b.60
c.75
d.96
MEDAL

Question

A manufacturer samples 100 wires for quality testing. Four of the wires are found to be defective. If 750 wires are produced in one hour, how many should the manufacturer expect to be defective?
a.30
b.60
c.75
d.96
MEDAL

anonymous · Answer

set up a fraction

anonymous · Answer

4/100 are deffects

anonymous · Answer

@Owlcoffee

campbell_st · Answer

use Number faulty =  probability x number of repeated events

owlcoffee · Answer

Let's set it up as a rule of three.
So, if 100 wires have 4 defective ones, then 750 will have x defective:
$$x=\frac{ 750x4 }{ 100 }=30$$

anonymous · Answer

oooooooooh! now i get it! thank you so much @Owlcoffee