Calculate the standard Deviation and its cofficient of the following Series :
Marks more than : 0 10 20 30 40 50 60 70
No. of students : 100 90 75 50 20 10 5 0
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Answer:
Scores
x Frequence
f fx Deviation from mean d=(x−
x
) d
2
fd
2
10 4 40 −19 361 1444
20 3 60 −9 81 243
30 6 180 +1 1 6
40 5 200 +11 121 605
50 2 100 +21 441 882
n=20 ∑fx=580
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