Answer: 0.9765
Explanation:
The cumulative distribution function for exponential distribution for random variable x is given by :-
, where
is the mean of the distribution .
Given : On average, 5 customers arrive at the drive-up window of a fast-food restaurant every 4 minutes during the lunch hour.
Then 
Now, the probability that the next customer will arrive within three minutes :-

Hence, the probability that the next customer will arrive within three minutes = 0.9765
<em>Let's review our options</em>
<em>Social Security Number</em><em>, this will be needed as it will prove you are a citizen in the United States and not some scammer looking for money to keep.</em>
<em>Completion of High-School Education</em><em>, FAFSA is only awarded to those going to college and you must complete high school to do so.</em>
<em>A sports scholarship</em><em>, Not needed for the FAFSA as you won't get as much or any money from the FAFSA if you are receiving aid already.</em>
<em>Submission of FAFSA</em><em>, This is the most obvious one, the only way to get money from FAFSA is to submit the free application.</em>
<em>Professional Work Experience</em><em>, this is not needed, if you are applying for FAFSA and have an income you will get less money.</em>
<em />
<em>Social Security Number, Completion of High-School Education, and Submission of FAFSA are correct!</em>