Use the Information Below to Answer the Following Question(s)

Multiple Choice

Use the information below to answer the following question(s) .
A bank is opening a new location in a business district.They have to determine how many teller windows to have open during the busy lunchtime hour.The demand during this hour is forecast to be normally distributed with a mean of 23 customers and a standard deviation of 10 customers.The average business revenue generated from each customer is $25 and each customer takes an average of 5 minutes to be served.Tellers are paid an hourly wage of $20.
-What is the value of the critical fractile?

A) 0.4
B) 0.48
C) 0.54
D) 0.65