The formula to calculate the Survey Response Rate (RR) is:
\[ RR = \left(\frac{NR}{NS}\right) \times 100 \]
Where:
Let's say the number of responses received (NR) is 150, and the number of surveys sent (NS) is 500. Using the formula:
\[ RR = \left(\frac{150}{500}\right) \times 100 \]
We get:
\[ RR = 30\% \]
So, the survey response rate is 30%.