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
The answer is B unreliable narrator. This is the correct answer because he is not always trustworthy so you shouldn't rely on this narrator.
Its C, hope this helps!!!
Answer: I gave three functions
To let the reader know a sentence is beginning, to show important words in a title, and to signal proper names and official titles.
Explanation: