Erma maintains an active blog about her seashell collection. she has 500 white shells, 325 yellow shells, 15 pink shells, and 60 green shells in her jar. she asks sweet t to reach into her jar of seashells and randomly select a shell. then she replaces it and shakes up the jar before asking sweet t to pick another shell. if sweet t repets this 200 times, about how many shells can he expect to be greer?