6. The following table gives the frequency distribution of marks obtained by 150 students in a certain examination. Marks: 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 No. of students: 7 10 20 40 30 28 10 5 From the above distribution, calculate the standard deviation and the co-efficient of varia- tion.

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6. The following table gives the frequency distribution of marks obtained by 150 students in a
certain examination.
Marks:
0–10
10-20
20-30
30-40
40–50
50–60
60–70
70-80
No. of students: 7
10
20
40
30
28
10
5
From the above distribution, calculate the standard deviation and the co-efficient of varia-
tion.
Transcribed Image Text:6. The following table gives the frequency distribution of marks obtained by 150 students in a certain examination. Marks: 0–10 10-20 20-30 30-40 40–50 50–60 60–70 70-80 No. of students: 7 10 20 40 30 28 10 5 From the above distribution, calculate the standard deviation and the co-efficient of varia- tion.
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