The probability that his or her drink will be a medium is 0.48
<h3>Definition of Probability </h3>
This is a likelihood or chance that an event will occur.
- Probability = Expected/Total
Since there are 100 customers, hence the total outcome will be 100
Total customers that drank medium = 48 + 12 = 60
Pr(customers will drink medium) = 48/100 = 0.48
Learn more on probability here: brainly.com/question/25870256