The mean inside diameter of a sample of 300 washers produced by a machine is 0.492 inches and the standard deviation is 0.004 inches. The purpose for which these washers are intended allows a maximum tolerance in the diameter of 0.486 to 0.498 inches, otherwise the washers are considered defective. Determine the percentage of defective washers produced by the machine, assuming the diameters are normally distributed.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

step-by-step explanation:

i think its a and d

step-by-step explanation:

yes.. it's proven to be 36.