A company sells, amongst other products, a medicated shampoo. The shampoo is sold in container sizes that are labeled as containing 500 ml. The volume of liquid that is actually put into the containers is normally distributed with a mean of 510 ml and a standard deviation of 10 ml. (a) Estimate the probability that a container chosen at random will hold

(i) more than 520 ml
(ii) between 495 ml and 515 ml
(iii) less than the advertised amount