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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