## Answer :

### Final answer:

Discrete and continuous variables are distinguished by countability and measurability, respectively.

### Explanation:

**Discrete variables** can be counted and typically consist of distinct values such as whole numbers. **Continuous variables** are measured and can take on any value within a certain range.

**Number of stocks sold every day:**Discrete**Hourly temperatures recorded:**Continuous**Lifetime of a car:**Continuous**Diameter of wheels:**Continuous**Number of children from families:**Discrete**Annual Census of Americans:**Discrete

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