Question

3.
If the random error in the arithmetic mean of 50 observations is a, then the random error in the arithmetic
mean of 150 observations would be
​

Answer 1

Answer:

mean = sum of observations / no of observations

= 150+50/2

=200/2

= 100

hope this answer will help you

Answer 2

Answer:

Given : -

• If the random error in the arithmetic mean of 50 observations

To Find : -

• e random error in the mean of 150 observations would be

Solution : -

The n random error is = a/n

substitute all values :

then the random error in the mean of 150

= 150 / 50

= 3

the mean of 150 observations would be

= a / 3

Option ( 3 .) is correct !