# Thirteen out of 20 emails in your inbox are junk emails. What is the experimental probability that your next email is junk?

Mar 15, 2017

$P \left(\text{junk mail}\right) = \frac{13}{20}$

#### Explanation:

Experimental probability is determined by actual results, while theoretical probability is determined by maths based on numbers.

The fraction of junk mails so far is $\frac{13}{20}$.

Therefore based on these results, there is a $13 \text{ in } 20$ chance that the next email will be junk mail. This is the same as the fraction.

$P \left(\text{junk mail}\right) = \frac{13}{20}$