Here, we observe that 10 students have scored marks below 10 i.e., it lies between class interval 0-10. Similarly, 50 students have scored marks below 20. So, 50-10=40 students lies in the interval 10-20 and so on. The table of a frequency distribution for the given data is
Class intervalNumber of students0−101010−2050−10=4020−30130−50=8030−40270−130=14040−50440−270=17050−60570−440=13060−70670−570=10070−80740−670=7080−90780−740=4090−100800−780=20