Final answer:
The sum of 7.5g, 2.26g, 1.311g, and 2g is 13.071g, which should be rounded to zero decimal places as the least precise measurement is 2g. The correct answer is 13g.
Step-by-step explanation:
To find the correct answer for the calculation 7.5g + 2.26g + 1.311g + 2g, we start by adding these values together, which would give us a preliminary sum. However, when summing measurements with different decimal places, the final result should be reported to the least number of decimal places of any number in the data set for precision.
In this case, the least precise measurement is 2g (which has no decimal places), meaning our final answer should be rounded to 0 decimal places. Therefore, the sum should be rounded accordingly.
Adding the numbers gives us 7.5 + 2.26 + 1.311 + 2 = 13.071. Rounding this to zero decimal places gives us 13g which is represented by option 2).