this is a probability question

QUESTION 3 [20 MARKS] a) A survey was conducted to investigate the age distribution of persons arrested for careless driving. They are distributed in a five different age groups. To test the hypothesis that number of arrested drivers are equal among these five groups, a random sample of 100 persons arrested for careless driving is identified. Given the hypotheses as below, Ho: p1 = p2 = p3 = p4= p5 H1: At least one of the p; is not equal i. If the resulting of test statistic, x2 = 16.5, what conclusion would you make when using 0.01 level of significance? (3 marks) ii. If there were only four groups of age rather than five groups, what would you conclude if x2 = 9.5 with 0.01 level of significance