The inside diameter of a randomly selected piston ring is a random variable with mean value 15 cm. Let X be the diameter of a randomly chosen piston ring.

Find or bound the following probabilities the best that you can:

a.) P(X 17)

Now, let the standard deviation of X be 0.1 cm. Find or bound the following the best you can.

b.) P(14.8 < X < 15.2)