Question

The variance of the following continuous frequency distribution is 

Class Interval	\(0\!-\!10\)	\(10\!-\!20\)	\(20\!-\!30\)
Frequency	\(3\)	\(4\)	\(3\)

• A. \(15\)
• B. \(30\)
• C. \(45\)
• D. \(60\)

Hint:

For grouped data, \[ \boxed{ \text{Variance} = \frac{\sum f(x-\bar{x})^2}{\sum f} } \] where \(x\) denotes the class marks.

Answer 1

The Correct Option is D