| Variate x | 1 | 2 | 3 | 4 | 5 |
| Frequency f of x | 4 | 5 | y | 1 | 2 |
A) 24
B) 13
C) 8
D) 3
Correct Answer: C
Solution :
We know that, Mean\[=\frac{\sum\limits_{i=1}^{n}{{{f}_{i}}{{x}_{i}}}}{\sum\limits_{i=1}^{n}{{{f}_{i}}}}\] i.e., \[2.6=\frac{1\times 4+2\times 5+3\times y+4\times 1+5\times 2}{4+5+y+1+2}\] or \[31.2+2.6y=28+3y\] or \[0.4y=3.2\] Þ \[y=8\].
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