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\frac{\partial}{\partial \theta_0} J(\theta_0, \theta_1) = \frac{1}{m} \sum_{i=1}^{m}(h_\theta(x^{(i)}) - y^{(i)})
\sigma=10,r=28,b=\frac{3}{8}
a^{-1}
f_X(x)=\begin{cases}
          cx^{\alpha-1}e^{-\lambda x} & (x>0)\\
          0 &(others)
       \end{cases}
f_X(x)=\lambda e^{-\lambda x} \ (x>0)