The mean of the values of \( 1,2,3, \ldots ., \mathrm{n} \) with respective frequencies \( \math...

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The mean of the values of \( 1,2,3, \ldots ., \mathrm{n} \) with respective frequencies \( \mathrm{x}, 2 \mathrm{x}, 3 \mathrm{x}, \ldots . . \mathrm{nx} \) is:
a. \( \frac{2 n+1}{2} \)
b. \( \frac{2 n+1}{6} \)
c. \( \frac{\mathrm{n}}{2} \)
d. \( \frac{2 n+1}{3} \)
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