The inner diameter of a piston is normally distributed with mean of 10 cm and standard deviation 0.03cm

Question

a)below what value of inner diameter will fall fifteen percent of the piston rings?

Answer 1

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.15) related to a Z score. Insert the values into the above equation.