WHAT IS ACCURACY AND PRECISION..??

ACCURACY  :-

Accuracy refers to the closeness of a measured value to a standard Or known value value.

For Example :- 

If in lab you obtain a weight  measurement of 3.2 kg for a given substance , but the actual Or known weight is 10 k.g , then your measurement is not accurate.

In this case , your measurement is not close to the known value.

PRECISION :-

Precision refers to the closeness of two Or more measurements to each other.

Using the example above  :-  

If you weigh a given substance five times , and get 3.2 k.g each time , then your measurement is very precise.

Precision is independent of accuracy.

You can be very precise but inaccurate , as described above.

You can also be accurate but imprecise.

;)