" mean of "150" observations would betic mean of "50" observations is "alpha" ,then the random error in the arithmet "

if the randon error in the arithmetic mean of 50 observations is alpha , then the random error in the arithmetic mean of 150 observations would be

if the randon error in the arithmetic mean of 50 observations is alpha , then the random error in the arithmetic mean of 150 observations would be

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 100 observations is x, then random error in the arithmetic mean of 400 observations would be

The random error in the arithmetic mean of 100 observations is x, then random error in the arithmetic mean of 400 observations would be

If the mean of m observations out of n observations is n and the mean of remaining observations is m, then what is the mean of all n observations ?

The arithmetic mean of 11 observations is 11. The arithmetic mean of the first 6 observations is 10.5 and the arithmetic mean of the last 6 observations is 11.5. What is the sixth observation ?