Answer: The mean rate given by customer is -1.25
Step-by-step explanation: We are given the following in the question:
-3.5, 4, 4.5, -5.25, -4, -3.25, -4.25, 1.75
Formula:
Putting values, we get,
Thus, the mean rate given by customer is -1.25 you may mark brainliest