#### Answer

0.4972

#### Work Step by Step

$z_1=\frac{value-mean}{standard \ deviation}=\frac{110-100}{15}=0.667.$
$z_2=\frac{value-mean}{standard \ deviation}=\frac{90-100}{15}=-0.667.$ Using the table, the value belonging to 0.667: 0.7486, the value belonging to -0.667: 0.2514. 0.7486-0.2514=0.4972.