Question

if 4 students in a class of 20 are randomly chosen to present their project. what is the probability of not being chosen to present?

Explanation:

Step1: Calculate number of non - chosen students

The number of students not chosen is $20 - 4=16$.

Step2: Calculate the probability

The probability $P$ of not being chosen is the number of non - chosen students divided by the total number of students. So $P=\frac{16}{20}=\frac{4}{5}$.

Answer:

$\frac{4}{5}$