Electric field

The electrostatic potential in some region of space only depends on $x$. Since the electric field is related to the electrostatic potential by $\vec{E} = -\nabla \varphi$, the electric field will only have a component in the $x$-direction. The value of the electrostatic potential as a function of $x$ is given in the table below. What is the $x$-component of the electric field at $x=0.2$ m?

Use the numerical integration app to calculate the electric field.