Answer
0.4972.
Work Step by Step
$z_1=\frac{value-mean}{standard \ deviation}=\frac{110-100}{15}=0.67.$ $z_2=\frac{value-mean}{standard \ deviation}=\frac{90-100}{15}=-0.67.$ Using the table, the value belonging to 0.67: 0.7486, the value belonging to -0.67: 0.2514. 0.7486-0.2514=0.4972.