126. Solving a chemistry problem

4. In the sample of synthesized gold nanoparticles, the particle diameter is distributed approximately normally, with the arithmetic mean and with the standard deviation s indicated in the table below for the corresponding problem number. Calculate (for your problem number) the proportion of particles in the sample whose diameters are in the range from x1 to x2, assuming µ= and σ=s.
task number 4
x /nm s/nm x1 /nm x2 /nm
6.3 2.7 5.0 9.0