A research worker takes `100` observations in an experiment . If he repeats the same experiment by taking `500` observation , how is the probable error affected?

An observer takes 10 observations in an experiment .I he repeats the same experiment by taking 20 observations by what factor error will be reduced ?

A science student takes 100 observations in an experiment. Second time he takes 600 observations in the same experiment .By doing so the possible error becomes:

A physicist performs an experiment and takes 200 readings. He repeats the same experiment and now takes 800 readings. By doing so the probable error

A scientist performs an experiment in order to measure a certain physical quantity and takes 100 observations. He repeats the same experiment and takes 400 observations, by doing so

A scientist performs an experiment in order to measure a certain physical quantity and takes 100 observations. He repeats the same experiment and takes 400 observations, by doing so

A scientist performs an experiment in order to measure a certain physical quantity and takes 100 observations. He repeats the same experiment and takes 400 observations, by doing so

He is the first to do experiments and observation on different kinds of air.

A scientist performs an experiment and takes 100 readings. He repeats the same experiment and now takes 500 readings, By doing this what is the advantage?