In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:
Assertion (A) : If the arithmetic mean of \(x\), \(x + \)3, \(x + \)6, \(x + \)9 and \(x + \)12 is 10 then \(x = \)4.
Reason (R) : \(\text{Mean of raw data} = \frac{\text{Product of obervations}}{\text{Number of observations}}\)