The mean of first 7 observation is 55 and also the mean of last 7 observation is 58. If the mean of all 13 observation is 57 then find the 7th term....pls answer fast
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Sum total of first 7 observations=55*7=375
Sum total of last 5 observations =58*7=406
Total of these observations =375+406=781
Mean of the original 13 observations =57
Sun total of 13 observations =57*13=741
Therefore, 7th term =781-741=40(ans)
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