if the mean of a set of observations x1,x2.....x10 is 20.Find the mean of x1+4,x2+8,x3+12,......x10+40.
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x3+12,x4+16,x5+20,x6+24,x7+28,
x8+32,x9+36,x10+40
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For this ap has to be used.....the sum of the multiples of 4
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