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If the random error in the arithmetic mean of 50 observations is x then random error in the arithmetic mean of 150 observations would be???



 3x is the answer as 50 x 1 = x no of errors 
if we multiply 50 x 3 = 150 
so if we want to calculate the no. of random errors in 150 we will multiply 
X by 3 
so X . 3 = 3x
0 0 0
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