Final answer:
The correct sign to compare these two numbers is > (greater than).
Step-by-step explanation:
To compare the numbers 0.155 and 0.115, we can look at the digits after the decimal point. The number 0.155 has a larger digit in the thousandths place compared to the number 0.115. Therefore, we can say that 0.155 is greater than 0.115. The correct sign to compare these two numbers is > (greater than).