Answer:
Solution
Step-by-step explanation:
Hope this helped :)
2x - 4y = 10
7x - 9y = 12
_________
9x - 5y = 2
Answer:
121/24 or 5 1/24
Step-by-step explanation:
The exponential distribution is:

where

The probability we want is how likely will a dvd player last more than 8 years, given it has already lasted 5 years
To find this, you use conditional probability.

where A is P(x>8) and B is P(x>5)
To find these probabilities, integrate over the distribution:

Sub into conditional probability formula:

Final Answer: Given a dvd player is more than 5 years old, the probability that it will last another 3 more years is about 54.9%