| Value | 1 | 2 | 3 | 4 |
| Frequency | 5 | 4 | 6 | f |
A) 3
B) 7
C) 10
D) 14
Correct Answer: D
Solution :
[d] Mean \[=\frac{1\times 5+2\times 4+3\times 6+4\times f}{5+4+6+f}\] \[i.e.,3=\frac{5+8+18+4f}{15+f}\Rightarrow 45+3f=31+4f\] \[\Rightarrow 45-31=f\Rightarrow f=14.\]
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