Question

Consider the frequency distribution of the given number

Value	1	2	3	4
frequency	5	4	0	f

If mean of the distribution is equal to 3, then the value of ' f ' is

• A. $7$
• B. $9$
• C. $12$
• D. $14$

Answer 1

Answer: (D)

$14$

Mean = $\frac{1\ast 5+2\ast 4+3\ast 0+4\ast f}{5+4+0+f}=3$

$\Rightarrow 13+4f=3(9+f)$

$\Rightarrow f=14$