Question

The probability that a battery will last 10 hr or more is 0.7, 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. (Round your answer to three decimal places.)

Answer 1

evidently if it lasts 15 hours or more it has already lasted more than 10 so
\[\frac{P(A\cap B)}{P(B)}=\frac{.11}{.7}\] in this example

Answer 2

ohhhh! thanks

Answer 3

yw