The mean of 10 numbers is 20 ,if 2 is subtracted from each no.,find new mean
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total of 10=200
total after subtracting 2 from each no =180
mean=18
total after subtracting 2 from each no =180
mean=18
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x1+x2+x3+x4+x5+x6+x7+x8+x9+x10/10=20
x1+x2+x3+x4+x5+x6+x7+x8+x9+x10=10*20
x1+x2+x3+x4+x5+x6+x7+x8+x9+x10=200 let it be equation 1
now,
x1-2+x2-2+x3-2+x4-2+x5-2+x6-2+x7-2+x8-2+x9-2+x10-2/10
=x1+x2+x3+x4+x5+x6+x7+x8+x9+x10-20/10 let it be equation 2
put value of equation 1 in equation 2
200-20/10=180/10=18
x1+x2+x3+x4+x5+x6+x7+x8+x9+x10=10*20
x1+x2+x3+x4+x5+x6+x7+x8+x9+x10=200 let it be equation 1
now,
x1-2+x2-2+x3-2+x4-2+x5-2+x6-2+x7-2+x8-2+x9-2+x10-2/10
=x1+x2+x3+x4+x5+x6+x7+x8+x9+x10-20/10 let it be equation 2
put value of equation 1 in equation 2
200-20/10=180/10=18
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