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GATE2015-2-29

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The values of function $f(x)$ at $5$ discrete points are given below:

$$\begin{array}{|l|l|l|l|l|l|} \hline x  & 0& 0.1 & 0.2 & 0.3 & 0.4 \\ \hline f(x) & 0 & 10 & 40& 90 & 160 \\ \hline \end{array}$$
Using Trapezoidal rule with step size of $0.1$, the value of $\int_{0}^{0.4}f(x)dx$ is __________
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