Suppose that the income distribution of 500 individuals in a small town shows a uniform distribution that is categorized with 5 groups, 0 - 20%, 21% - 40%, 41 - 60%, 61% - 80%, and 81% - 100%. The counts in the five groups are 116, 89, 109, 102, and 84, respectively. Test if the claim of the uniform distribution of income is true.