Answers

2016-03-12T18:02:28+05:30
Mean = ∑xi / n
12  =  ∑xi / 36
∑xi = 12*36
      =  432
correct sum = 432 - 74 + 47
                    = 405
correct mean = 405/36
                      = 11.25


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2016-03-12T18:39:25+05:30
Total sum of observatio=36×12=432
since,74-47=27
new sum of observation=432-27=405
new mean=405/36=11.25
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