Final answer:
In the number 918.0274, the tenths place is occupied by the number 0.
Step-by-step explanation:
In the number 918.0274, the tenths place is occupied by the number 0. Joan's mistake is that she answered 2 instead of 0. The tenths place is the position immediately to the right of the decimal point, and in this case, it is occupied by the number 0.