the mean of 5 observations is x .if 4 is added to each observation ,find the new mean
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a+b+c+d+e/5=x
a+b+c+d+e=5x
a+4+b+4+c+4+d+4+e+4=25x
20+5x=25x
20=25x-5x
20=20x
x=1
new mean=25
a+b+c+d+e=5x
a+4+b+4+c+4+d+4+e+4=25x
20+5x=25x
20=25x-5x
20=20x
x=1
new mean=25
this is not correct
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see it..............
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