Final answer:
Without sufficient data, we cannot calculate the average skin temperature change. The normal body temperature can vary based on individual and situational factors, but this information does not enable us to determine the average change.
Step-by-step explanation:
The student has not provided sufficient data to calculate the average skin temperature change. To determine an average, we would need individual temperature changes for the mentioned 130 subjects or the total sum of all temperature changes to divide by the number of subjects. If, for instance, the dataset showed various temperature readings post some external factor or condition change, we would subtract each final value from the initial temperature (presumably 98.6 °F) to determine the temperature change for each subject, sum up all these temperature change values, and then divide by the total number of subjects (130) to get the average temperature change.
Since the question does not provide numeral values or additional context to calculate the average change in skin temperature, we cannot select any of the answers (A, B, C, or D) provided in the question. However, we can discuss the concept that normal body temperature is not fixed and varies among individuals and according to different factors such as time of day. Additionally, conversions between Fahrenheit and Celsius were mentioned but are not directly relevant to calculating an average temperature change, unless we're converting the temperature values themselves.