Given in the question that;
17% of kids-------------attend overnight summer camp
11/50 of kids-----------attend a day camp
0.59 of the kids--------attend no summer camp
To find the greatest group , you need to compare the numbers as expressed in decimal form.
17/100 = 0.17 ------the smallest group
11/50 = 0.22 ------2nd largest group
and
0.59 ------largest decimal is for those that did not attend any summer camp.
Answer
0.5