In examining data collected over the past 10 years, researchers at a theme park find the following for 5000 first-time guests: 2250 visited during the summer months; 675 visited during the fall; 1300 visited during the winter; and 775 visited during the spring. What is the relative frequency for guests who visited during the spring?
a. .135
b. .155
c. .260
d. .450