Question

The lifespan of a 60-watt lightbulb produced by a company is normally distributed with a mean of 1450 hours and a standard deviation of 8.5 hours. if a 60-watt light bulb produced by this company is selected at random, what is the probability that its lifespan will be less than 1465 hours

Answer 1

To find probability of something random you can take three random things and times them by each other.
You haven’t given enough information for me to answer this completely.
But I would assume the answer is 100% or 99%.