By signing in you confirm you are 18 or older, or have your parent’s or guardian’s consent.

NDA 2 2025 Maths, question 120

Topic: Statistics

Q120

Consider the following statements :

I. Mean and variance have the same unit of measurement.

II. Mean deviation and standard deviation have the same unit of measurement.

Which of the statements given above is/are correct?

  1. (a) I only
  2. (b) II onlyCorrect answer
  3. (c) Both I and II
  4. (d) Neither I nor II

Solution.

Answer: (b) II only

  1. If observations have unit U, the mean has unit U but variance has unit U².
  2. Both mean deviation and standard deviation have unit U.
  3. Thus I is false and II true.