When the number of measurements increases, what happens to the uncertainty? do not simply say it increases or decreases, there is a specific change and this is what we are looking for here.

The uncertainty decreases

Explanation:

When  multiple measurements are made the size of the sample increases. The uncertainty component caused by the variability of repeated observations (also known as "Type A uncertainty") can be calculated by the equation:

where  

is the uncertainty  

is the standard deviation of the sample and

is the number of samples taken

As a result, when increases the uncertainity decreases

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

particle   p is an electron and particle q is a neutron