Answer:
The answer is option d-13 movies per month
Step-by-step explanation:
the reason is that is the first point on the graph that is above the price of the cost of the monthly unlimited movies
-7.14 should be your answer!
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%
Answer: 10.5
Step-by-step explanation:
Hope it's right!