Answer
0.9074
Work Step by Step
We calculate the z-score:
$z_1=\frac{x-\mu}{\sigma}=\frac{40-50}{7}=-1.43$
$z_2=\frac{x-\mu}{\sigma}=\frac{65-50}{7}=2.14$
We look up $z_1$ in Table V and get the area to the left of 0.0764.
We look up $z_2$ in Table V and get the area to the left of 0.9838.
We subtract the two areas to get the area in between:
0.9838-0.0764=0.9074