Answer:
a. Discrete data
b. Continuous data
c. Discrete data
d. Continuous data
Explanation:
a. It is always possible to count the number of customers in a line, this is a type of discrete random variable.
b. The weight of a baby in its first year or the temperature in a room throughout the day.
c. Shoe sizes can be decimals (7.5 or 8.5) but there are still a fixed set of possible values with gaps between them (there is no 7.9 shoes size). Therefore shoe size is a discrete random variable.
d. The length is typically considered a continuous variable, since, a sea otter will typically not measure exactly 5 feet, but the length will differ by some fraction of a foot.