A Major Producer of Incandescent Light Bulbs Wishes to Model

Multiple Choice

A major producer of incandescent light bulbs wishes to model the amount of time incandescent bulbs manufactured at a specific plant will last.The company uses an exponential random variable to model bulb life.If random variable X, which represents the lifetime of these incandescent bulbs, is exponentially distributed with λ = 0.0012 (corresponding to measurements in hours) , what is the modeled mean lifetime of these bulbs?

A) 1200 hours
B) 833.3 hours
C) 694,444 hours
D) 921.2 hours