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Each question consists of two statements, namely, Assertion $(A)$ and Reason $(R)$. For selecting the correct answer: use the following code:
Assertion $(A)$
Consider the following frequency distribution:

Class interval	$3-6$	$6-9$	$9-12$	$12-15$	$15-18$	$18-21$
Frequency	$2$	$5$	$21$	$23$	$10$	$12$

The mode of the above data is $12.4.$
Reason $(R)$
The value of the variable which occurs most often is the mode.

• A
  Both Assertion $(A)$ and Reason $(R)$ are true and Reason $(R)$ is a correct explanation of Assertion $(A).$
• ✓
  Both Assertion $(A)$ and Reason $(R)$ are true but Reason $(R)$ is a not a correct explanation of Assertion $(A).$
• C
  Assertion $(A)$ is true and Reason $(R)$ is false.
• D
  Assertion $(A)$ is false and Reason $(R)$ is true