Normal Distributions Are Very Commonly Used for Quality Control in Manufacturing

Multiple Choice

Normal distributions are very commonly used for quality control in manufacturing. For example, a
Manufacturer of light bulbs would surely be interested in studying how long their bulbs last. In one
Case, the lifetime of one model of light bulb is normally distributed and has a mean X = 1,800 hours
And a standard deviation of s = 250 hours. What percentage of bulbs would you expect to last longer
Than 2,550 hours?

A) 2.3%
B) 0.1%
C) 50%
D) 99.9%