Distribution, work you did that was wrong. . .etc.
Got this wrong on my assignment, please help?
The average life of a light bulb is 500 hours. Find
a)the probability that a bulb will last more than 1,000 hours
b)the probability that a bulb will last less than 100 hours
c)the median life
d)the probability that a bulb will last exactly 500 hours
e)the 95 Percentile
If it's an exponential distribution with an AVERAGE (mu) lifetime of 500 hours, then from your notes you should remember that:
Solving for lambda will allow you to get your parameter lambda.
To find a through e you have to remember that is represented by , and for is represented by .
Try to work with that and see where you get, or at least show us the work you did that was determined to be wrong. To help you get started:
A. . Why? Because to find the probability that a component lasts longer than 1000 hours, we only need to find the compliment of it lasting SHORTER than 1000 hours. So: