The mean of 5 observations is 15. If the mean of first three observations is 14 and that
of the last three is 17, find the third observation.
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==> Mean of 5 observations = 15
==>The sum of observations = 15 * 5 = 75
==> Mean of the first 3 observations = 14 .
==> The sum of first three observations = 14 * 3 42
==> Mean of the last 3 observations = 17
.. The sum of the last three observations = 17 * 3 : 51 .
The third observation = ( 42 + 51 ) -75
= 93-75
= 18
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