in di=xi-a. how to find (a) in chapter statistics for class 10? please give me a answer
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To find the mean marks, we require the product of each xi with the corresponding frequency fi.
Marks obtained (xi) Number of students (fi) fixi
__________
10 1 10
20 1 20
36 3 108
40. 4ó 160
50 3 150
56 2 112
60 4 240
70 4 280
72 1 72
80 1 80
88 2 176
92 3 276
95 1 95
___________
Total Σ fi = 30 Σ fixi = 1779
`x= (Σf_i\x_i)/(Σf_i)`
`=(1779)/(30)=59.3`
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