The random error in the arithmetic mean of 50 observations is 'a', then the random error in the arithmetic mean of 200 observations would be ............

The random error in the arithmetic mean of 50 observations is 'a', the

1.	The random error in the arithmetic mean of 50 observations is 'a', then the random error in the arithmetic mean of 200 observations would be ............
Answer» ` 4A ` `16A^(2)` `a/4` `a/2` SOLUTION :`a/4`