The mean of 35 observation is 20, out of which mean is first 18 observation is 15 and mean of last 18 observation is 25.find the 18th observation
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let x is the total sum of observations.
then x/35=20
x=700
and let sum of 1st 18th observation be a and sum of last 18th observation be b.
then a=270 and b =450
as 18th observation is taken twice.
18th obs= a+b-x
=20.
then x/35=20
x=700
and let sum of 1st 18th observation be a and sum of last 18th observation be b.
then a=270 and b =450
as 18th observation is taken twice.
18th obs= a+b-x
=20.
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