Use the table below to estimate the value of $h'(.5)$, where $h(x)=f(g(x))$ to the nearest tenth. To estimate the appropriate derivatives, use the average of the two second slopes near the point in question (if approximating a derivative at $x=.1$, do the secant slopes on $[0,.1]$ and $[.1,.2]$, and then average them).

$h'(.5) =$