Let the mean and the variance of 5 observations \( x_{1} \), \( \ma...

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Let the mean and the variance of 5 observations \( x_{1} \),
\( \mathrm{P} \) \( x_{2}, x_{3}, x_{4}, x_{5} \) be \( \frac{24}{5} \) and \( \frac{194}{25} \) respectively. If the mean

W and variance of the first 4 observation are \( \frac{7}{2} \) and \( a \) respectively, then \( \left(4 a+x_{5}\right) \) is equal to:
(1) 13
(2) 15
(3) 17
(4) 18
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