steel rods are manufactured with a mean length of 25 CM. because of variability in the manufacturing process the lengths of rods are approximately normally distributed witha standard deviation of 0.06cm. a)what proportion of rods have a length less than 24.9? b) any rod shorter than 24.87 and longer than 25.13 discarded would be ? c) using result from (b) 5000 rods what would be discarded. d) using (b) if 10000 still rods how many rods should the plant manager expect to manufacture if the order states all rods be between 24.9 and 25.1 CM