Question

A manufacturer tested 7000 led lights at random and found and found that 25 of them were defective if a a led light is selected at random what is is the probability that the selected led light is a defective one

Answer 1

$probability = \frac{number \: of \: defective \: led \: lights}{total \: number \: of \: led \: lights}$

$probability \: = \: \frac{25}{7000}$

$probability = \frac{1}{280}$

Answer 2

$\frac{25}{7000}$

$= \frac{1}{280}$

is the correct answer