Question

Which of the following statements are true?
(i) Mean cannot be calculated for only two numbers.
(ii) There are three methods of finding the mean of grouped data.

• A. (i)
• B. (ii)
• C. (i) and (ii)
• D. Neither (i) nor (ii)

Answer 1

The correct option is B (ii)

Mean can be calculated for any number of data except one. The mean of a raw data is their simple average.
For grouped data, there are three methods of calculating the mean:
i. Direct method
ii. Assumed mean method
And, iii. Step deviation method.