Prob. 4. The following are the preliminary examination scores of section 1 and section 2 in Statistics. Section 1 Section 2 Scores No. of Scores No. of Students Students 30 -39 4 30 - 35 40 - 49 6 40 - 49 50-59 B 50-59 B 60- 69 12 60 -69 70-79 9 70- 75 10 80 - 89 7 80 -89 4 90 - 99 4 90 - 99 9 total total n= Based in your computed standard deviations which group has a better performance? Why