the mean of 13 observations is 14. if the mean of first 7 observations is 12 and that of last 7 is 16, find the 7th observation
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Mean of 13 observations= 14
sum of 13 observations = 13*14= 182
Mean of first 7 observations = 12
sum of first 7 observations = 7*12= 84
Mean of last 7 observations = 16
sum of last 7 observations = 7*16= 112
the 7th observation = 112- 84 = 28
sum of 13 observations = 13*14= 182
Mean of first 7 observations = 12
sum of first 7 observations = 7*12= 84
Mean of last 7 observations = 16
sum of last 7 observations = 7*16= 112
the 7th observation = 112- 84 = 28
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