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Given that the mean of 5 observation is 15 .
therefore the sum of observation is 15*5 = 75
given that the mean of first 3 observation is 14
therefore the sum of observation is 14*3 = 42
given that the mean of the last 3observation is 17
therefore the sum of observation is 17*3 = 51
hence,
the third observation = ( 42 +51 ) - 75
= 93 - 75
= 18
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