hoblem -3 x 68.5 40 30 x 10 -40 685 30 4...

hoblem -3 x 68.5 40 30 x 10 -40 685 30 40 22.83 62.83 Average marks is 62.83 lem the average marks from the following distribution iculate 10-15 15-20 20-25 30 30-35 rks 5-10 No. of students tion, Marks (CH) No. student (f) Midvalue(x) d Fd 2.5 5-10 10-15 125 15-20 20-25 225 +1 25-30 27.5 2 +15 30-35 +3 32.5 25 Using step deviation formula Assumed Mean (A) 17.5 Common factor (i is 5 30 x 5 17.5 17.5 17.5 t 1.2 18.7 llinnon four An were 5's, 30 were 6's and the 540

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