If you were spin a spinner numbered 1 - 10, what would is the probability of getting an odd number

We know that the odd numbers in the range 1 - 10 are:

1, 3, 5, 7, 9

This is 5 total numbers. If we take the amount of odd numbers possible and divide them by the total amount of numbers possible:

or 50%.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.