1).Construct the grouped frequency distribution table for the following data. 153,308,973,642,109,537,862,486,974,329,751,172,992,340,218,561,839,737,454,24
9,969,682,148,850,338,791,270,464,917,
539,305,772,927,255,863,603,495.

2). Find the mid value of the class 20➖30​