Question

The mean diameter of a thin brass rod is to be measured by vernier calipers. Why is a set of of of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only.

Answer 1

Hii dear,

# Reason-
On a vernier calliper, taking 100 readings is more reliable estimate than taking 5 readings because it minimizes personal and random errors in the measurement.

# Extra information-
1. Random error is an error in measurement caused by factors which vary from one measurement to another.
2. Personal error comes into existence due to making an error in reading a scale. It's type of systematic error.

Hope you understand well...

Answer 2

Answer:

it is due to the reason that random error involved in the mean value of 100 observation is much less than that involved in the mean value of 5 observation