the mean of five numbers is 27.if one is excluded their mean is 25.find the excluded observation
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Let us assume that the nos are a, b, x, y, z
Given,
Mean of 5 nos is 27
a+b+x+y+z/5=27
a+b+x+y+z=27×5
a+b+x+y+z=135….(1)
If one no. is excluded let it be ‘ a'
Mean of 4 nos. is 25
b+x+y+z/4=25
b+x+y+z=25×4
b+x+y+z=100….. (2)
So, (1) -(2)
a=(135–100) =35
Excluded number is 35.
Given,
Mean of 5 nos is 27
a+b+x+y+z/5=27
a+b+x+y+z=27×5
a+b+x+y+z=135….(1)
If one no. is excluded let it be ‘ a'
Mean of 4 nos. is 25
b+x+y+z/4=25
b+x+y+z=25×4
b+x+y+z=100….. (2)
So, (1) -(2)
a=(135–100) =35
Excluded number is 35.
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