The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches.
A) What percentage of bolts will have a diameter in between 0.279 and 0.326 inches?
B) Find the 90% percentile for the diameter of bolts.
C) Quality control manager has decided to name the bolts with diameter than .332 and less than 0.279 as low quality products. Find the % of low quality bolts.
D) If 5 such bolts are randomly selected, what is the probability that at least 4 will be a low quality product?