10 Marks scored by students in a mathematics test were recorded in the table below. Marks Cummulative frequency 10-19 5 20-29 14 30-39 26 (a) Determine the upper boundary of the modal class. 40-49 36 50-59 39. S 60-69 43 70-79 50 3 (2 marks) (b) Using an assumed mean of 39.5, calculate the mean mark. (c) Estimate: () Third decile. (EX) The number of students who passed the test if pass mark was set at 43.5. 2)