Samantha and Luis are attempting to determine the average number of library books that seventh-grade students check out at one time. Samantha surveys every other seventh grade student leaving the library. She samples a total
of 40 of the 200 seventh graders. Luis samples 30 of the 200 seventh grade students at random in the school
cafeteria. Whose sample is the most random?
O Luis because his sample is taken from the population of all seventh graders
O Luis because he samples fewer students
O Samantha because she samples more students
• Samantha because her sample is taken from the population of students who use the library

3th one brainliest please

Explanation:

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.

it should be briana that has it to me