You want to know what decimal fraction the green area
is of the whole area on the normal curve.

Notice it starts at z=1.22 on the z-axis and goes to z=2.15.

On a TI-83 or 84 calculator you can find it by

normalcdf(1.22,2.15).  You get .0954549502

On a normal table you look up 

z = 2.15 and find either .4842 or .9842, depending on what
kind of z-table you have.

Then you look up 

z = 1.22 and find either .3888 or .8888, depending on what
kind of z-table you have.

Then you subtract the two values

.4842-.3888 or .9842-.8888

and you'll get .0954

That's the fraction of the total area which the green
area is of the entire area.  As a percent the green area
is 9.54% of the total area between the z-axis and the normal
curve.

Edwin