Let \( \mathrm{X}=\{\mathrm{x} \in \mathrm{N}: 1 \leq \mathrm{x} \l...

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Let \( \mathrm{X}=\{\mathrm{x} \in \mathrm{N}: 1 \leq \mathrm{x} \leq 17\} \) and \( \mathrm{Y}=\{\mathrm{ax}+\mathrm{b}: \mathrm{x} \in \mathrm{X} \)
\( \mathrm{P}^{\mathrm{nn}} \) and \( \mathrm{a}, \mathrm{b} \in \mathrm{R}, \mathrm{a}0\} \). If mean and variance of

W elements of \( \mathrm{Y} \) are 17 and 216 respectively then \( \mathrm{a}+\mathrm{b} \) is equal to
(1) 7
(2) 9
(3) -7
(4) -27
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