Dear Bua,
If there were no different condition between 2 times of weighing.
It shows that their weighing machines are not accurate.
Khin,
Pls ask Ms SahSoh's assistant that are there different conditions between 2 times weighing by 2 weighing machines? Why data are difference? What does she think about these data if only different are weighing machines? Clarify my questions first, then I will email to Ms Sah Soh.
Rak