The probability density function of normal distribution of a random variable X is
\(f\left( x \right)\; = \;K{e^{\left( { - \frac{{{x^2}}}{{50}} + 4x - 200} \right)}}\;,\; - \infty \; < \;x\; < \; + \infty \)
What is the sum of mean and standard deviation?
1
100
2
105
3
125
4
150