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The mean of the values of 1, 2, 3, ..., n with respectively frequencies x, 2x, 3x, ..., nx is
A) \( \Large \frac{n}{2} \)
B) \( \Large \frac{1}{3} \left(2n+1\right) \)
C) \( \Large \frac{1}{6} \left(2n+1\right) \)
D) \( \Large \frac{n}{3} \)
Correct answer:
B) \( \Large \frac{1}{3} \left(2n+1\right) \)
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