The mean of 13 observations is 14.if the mean of the first 7 observations is 12,and that of the last 7 observations is 16,find the seventh 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
Hope I am clear and correct...!!
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