Question

A manufacturer makes 60,000 cell phones every year. After inspecting 2000 phones, the manufacturer found that 40 phones are defective. What is the probability that you will buy a phone and that is defective?

• A. $0.0004$
• B. $0.02$
• C. 50
• D. None of the above

Answer 1

The correct option is B $0.02$

Total trials = Total number of cell phones inspected = $2000$

Frequency of defective phones = $40$

$\text{P (defective phone)}=\frac{\text{Frequency of defective phone}}{\text{Total number of phones inspected}}$
$\Rightarrow \text{P (Defective phone)}=\frac{40}{2000}=0.02$

Hence, the probability that one will buy a phone and that is defective is $0.02$.