The mean of 5 observation is 20.if four observations are30,40,15,5 find the fifth observations.
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Mean=sum/number of observation
20=5+15+30+40+x/5
100=90+x
x=10
Therefore the fifth number is 10
20=5+15+30+40+x/5
100=90+x
x=10
Therefore the fifth number is 10
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