Given that it is normally distributed with a standard deviation of 8.025 cm. Find the range of the diameter that is two standard deviations from themean. Hence, state the proportion of the tubes with...

Given that it is normally distributed with a standard deviation of 8.025 cm. Find the range of the diameter that is two standard deviations from the
mean. Hence, state the proportion of the tubes with the diameters in
this range.