The probability that a battery will last 10 hr or more is 0.9, and the probability that it will last 15 hr or more is 0.11. Given that a battery has lasted 10 hr, find the probability that it will last 15 hr or more.
We are given with the data that says the probability that a battery will last 10 hr or more is 0.8 and the probability that it will last 15 hr or more is 0.11. In this case, the probability that the battery lasts at least 10 hours and even 15 hrs more is 0.11 / 0.8 or equal to 13.75 percent.
