Karen massed an object 3 times using the same equal arm balance and gram massed. Her results were 18.324 g 18.308 g and 18.342 g. How could she best report the mass of the object

To best report the mass of the object, she could just find the average for the three masses she measured.

average = total masses / number of readings

Total masses = 18.324 + 18.308 + 18.342 = 54.974 grams

number of readings = 3 readings

Therefore:

average mass of the object = 54.974 / 3 = 18.32466667 grams