Help with these from chapter 12 assignment please

Steel rods are manufactured with a mean length of 29 centimeter (cm). Because of variability in the manufacturing process, the lengths of the rods are approximately normally distributed with a standard deviation of 0.05 cm. Complete parts (a) to (d). (a) What proportion of rods has a length less than 28.9 cm? '1 (Round to four decimal places as needed.) Assume the random variable X is normally distributed with mean p = 50 and standard deviation 0 = 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. P(34