Answer: The probability that a randomly selected tire will have a tread-life of less than 65,000 miles is 0.7872 .
Step-by-step explanation:
The cumulative distribution function for exponential distribution is :-
, where
is the mean of the distribution.
As per given , we have
Average tread-life of a certain brand of tire : 
Now , the probability that a randomly selected tire will have a tread-life of less than 65,000 miles will be :

Hence , the probability that a randomly selected tire will have a tread-life of less than 65,000 miles is 0.7872 .
you just have to move the decimal point 9 places to the right thats an easy trick to remember 1849900000
Answer:
<h2>z = 15</h2>
Step-by-step explanation:

<u>Cross multiply </u>
That's

<u>Send 15 to the right side of the equation</u>

Divide both sides by 15

We have the final answer as
<h3>z = 15</h3>
Hope this helps you
Answer:
B (r= 1/6s)
Step-by-step explanation:
If you just work out each option, you'll see that "s" multiplied by 1/6 gets r.