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The mode of the following discrete series is:
$\begin{array}{ccccccc} x_{i} & 1 & 3 & 5 & 6 & 12 & 15 \\ f_{i} & 5 & 7 & 3 & 8 & 6 & 5 \end{array}$

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detailed solution

Correct option is D

We observe that the value 6 has maximum frequency. So mode = 6.

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The mode of the following discrete series is: xi13561215fi573865

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The mode of the following discrete series is:
$\begin{array}{ccccccc} x_{i} & 1 & 3 & 5 & 6 & 12 & 15 \\ f_{i} & 5 & 7 & 3 & 8 & 6 & 5 \end{array}$