What proportion of the area under the curve falls between z

What proportion of the area under the curve falls between z = -2.0 and z = + 1.0?

Solution

Given

Z=-2.0 andz=1.0

From ztables under curve

The area of -2.0 is 0.0228

The area of 1.0 is 0.8413

The area under curve falls between z=-2.0 and z=1.0

{0.8413}-{0.0228}={0.8185}

Therefore proportion of area under the curve falls between -2.0 and 1.0 is 81.86%.

{Please refer ztables of curve in Google if u need.(z=1.0) or you will get ztables in Google..if necessary please check it out}