12. Marks obtained by 25 students in Mathematics examination out 63,41, 87, 63, 33, 49, 78, 91, 80, 37, 52, 55, 68, 71, 43, 37, 51, 50, 67, 75, 76, 39, 52, 71, 81 (a) Arrange the data in ascending order. (b) Find out the lowest marks obtained. (c) How many students have scored more than 75 marks? (d) How many students have scored less than 50 marks? shirt size of 40 students of a school. ​