We are told that Namid bought 20 raffle tickets out of 500 sold. Recall that the experimental probability of an event measures the likelihood that the event occurs based on the actual results of an experiment.
P(Event)= Number of times the event occurs/Number of times the experiment is done
We want to find the probability that Namid will not win the raffle. Note that this is a complement. The sum of the probability of an event and the probability of its complement is 1.
P(Event)+P(Not event)=1
Let's start by finding the probability that one of Namid's tickets is chosen, which will be our event. The number of times the event occurs is the number of Namid's tickets, 20, and the number of times the experiment is done is the total number of tickets, 500.
P( Namid)= 20/500 l← ← lNamid's tickets Total tickets
The experimental probability of Namid's win is 20500. Let's now find the probability of its complement, which is Namid not winning the raffle.
