Answer:
1,050
Step-by-step explanation:
If 15 people out of 50 liked strawberry best.
The relative frequency of liking strawberry best in Sam's hometown will be:
Relative Frequency = 
Expected Outcome=Relative Frequency X Number of Trials
Therefore, out of the 3500 residents:
Number of People Expected to like strawberry best
= 
=1,050
X=0.25 is the most logical answer