Find mean by step deviation method

Dear student 
TABLE
Assemble the Xin ascending order.
Total number of terms = 10
Let D = 86
Xi C = Xi - D
79 -7
80 -6
82 -4
83 -3
84 -2
85 -1
86 0
86 0
88 2
89 3

C = -18
Mean = CTotal number of terms  + DMean = -1810+86 = 84.2

Regards

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