Question

a computer manufacturer is performing a quality check to make sure the computers’ sound cards are working correctly. the plant manager tested 1,000 computers on monday and found that 4 had defective sound cards. what is the experimental probability of a computer having a bad sound card? . (leave answer in fraction form)

Explanation:

Step1: Recall probability formula

The experimental - probability formula is $P(A)=\frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}$.

Step2: Identify values

The number of favorable outcomes (computers with defective sound - cards) is 4, and the total number of outcomes (total number of computers tested) is 1000.

Step3: Calculate probability

$P=\frac{4}{1000}=\frac{1}{250}$.

Answer:

$\frac{1}{250}$