The heights (in cm) of 50 students of Class 10 were recorded and grouped as follows:
Height (cm): 140–145, 145–150, 150–155, 155–160, 160–165, 165–170, 170–175
Number of students: 4, 6, 10, 12, 9, 6, 3
Using the above information, answer the following.
(i) Determine the class mark for each class interval and tabulate your results.
(ii) Choose suitable scales and draw a frequency polygon for the distribution on graph paper.
(iii) From your polygon, identify the class interval corresponding to the highest point and state its significance in the context of the data.