Final answer:
To determine the probability of each size wave, subtract the sum of the probabilities of small and medium waves from 100%. The probabilities are: small waves (15%), medium waves (60%), and large waves (25%).
Step-by-step explanation:
To determine the probability of having each size wave, we can use the information provided in the surf report. The report states that there is a 15% chance of small waves and a 60% chance of medium waves. From this, we can calculate the probability of large waves by subtracting the sum of the probabilities of small and medium waves from 100%.
Probability of small waves: 15%
Probability of medium waves: 60%
Probability of large waves: 100% - (15% + 60%) = 25%