Answer
0.7175
Work Step by Step
We calculate the z-scores:
$z_1=\frac{x-\mu}{\sigma}=\frac{38-50}{7}=-1.71$
$z_2=\frac{x-\mu}{\sigma}=\frac{55-50}{7}=0.71$
We look up $z_1$ in Table V and get the area to the left of 0.0436.
We look up $z_2$ in Table V and get the area to the left of 0.7611.
We subtract the two areas to get the area in between:
0.7611-0.0436=0.7175