For a and b, make sure to include explanations as to why that is the answer, thank you.

[3](10) Select your answer that is most appropriate to the following statement. In a set of date, blood lead levels are represented as 1 for low, 2 for medium, and 3 for high. The average (mean) of the 797 blood levels is 1.3. a) What level of measurement (nominal, ordinal, interval, or ratio) are the data at? b) What's wrong with the given calculation if any? Explain why so. A. Such data should not be used for calculations such as an average. B. One must use a different method to take the average of such data. C. The true average is 2.5. D. There is nothing wrong with the given calculation. Your reason