From the table given below, what is mean of marks obtained by 20 students?

[answerhappygod]

Marks xi
No. of Students fi


3
1


4
2


5
2


6
4


7
5


8
3


9
2


10
1


Total
20
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a) 6.9
b) 5.8
c) 6.6
d) 6