Which of the following is an example of discrete variable? a. Number of customers visited in a store b. Temperature levels in various cities c. Height of students in a college d. Weight of new born babies in a hospital
The Correct Answer and Explanation is:
Correct Answer: a. Number of customers visited in a store
A discrete variable is a type of quantitative variable that takes on countable, distinct values. These values often come from counting something rather than measuring. Discrete variables cannot have fractional or decimal values between two points; they move in individual steps.
In contrast, a continuous variable can take any value within a range, including fractions and decimals. Continuous variables are typically obtained by measuring, and they can represent infinitely fine differences within a given range.
Let’s analyze each option:
- a. Number of customers visited in a store
This is a discrete variable because the number of customers can be counted as whole numbers. You can have 5 customers, 10 customers, or even 0 customers, but you cannot have 3.5 customers. This variable increases in steps and cannot be divided further in a meaningful way in this context. - b. Temperature levels in various cities
This is a continuous variable. Temperature can be measured to any degree of precision such as 21.3°C, 21.35°C, etc. It can vary smoothly over a range and is not restricted to whole numbers. - c. Height of students in a college
Height is also a continuous variable. It can be measured precisely to fractions of centimeters or inches, and it can take on any value within a realistic range. - d. Weight of newborn babies in a hospital
This is another continuous variable. Like height, weight can be measured very precisely using scales and includes fractional values.
Therefore, only the number of customers visited in a store fits the definition of a discrete variable. It involves counting specific events, and the values cannot be subdivided meaningfully in a practical context.
