suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard deviation if 110 hours. if exactly 95% of the bulbs die before 920 hours, find the mean lifetime if the bulbs aleks answer

f is the midpoint of

the answer is d

hope this

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.