what would my conclusion be for this? i'm kind of confuzed...?

Question

Title: Bean Bag Isotopes (Relative Abundance and Atomic Mass)

Purpose: “The purpose of this experiment is to investigate the mass properties and relative abundance of isotopes for the ‘bean bag’ element (symbol, Bg) and to calculate the atomic mass of this element.”

Procedure:
1. “Sort the atoms in the ‘bean bag’ element sample (Bg) into three isotope groups (1,2, and 3) according to the type of bean. (Assume that each type of bean represents a different isotope and that each bean represents a separate atom.) Place each isotope group into a separate weighing dish or small cup.”

2. “Count and record the number of Bg atoms in each isotope group.”

3. “Measure the total mass of Bg atoms belonging to each isotope group. Record each mass to the nearest 0.01 g in the data table. Note: Zero (tare) the balance with and empty weighing dish and record the mass. Do this for each group.”

Data:
“Bean Bag” Isotope - Number of Atoms - Total Mass of Atoms
1. Red 144 39.9 g
2. Black 40 7.67 g
3. White 10 2.56 g

Results:
“Bean Bag” Isotope - Average Mass - Percent Abundance
1. Red About: .2777 About: 74.2%
2. Black About: .19175 About: 20.62%
3. White About: .256 About: 5.15%

Conclusion:
?

Answer 1

Well, you know the atomic masses of the isotopes and their relative abundance. They ask for the atomic mass of Bg. The "official" atomic mass will be the masses of the isotopes, averaged together in proportion to their relative abundance.