Answer: a. Ratio b. Nominal c. Interval d. Ordinal
Explanation:
1)Ratio:You can do all sort of arithmetic on the cholesterol level.
2)Nominal: These cannot be ordered or arithmetic cannot be applied
3)Interval: It is interval because it is a number and midnight means 0 so you cannot use it for division
4)Ordinal: You can arrange it in increasing or decreasing order.