that ah eustomers go through steps B1 and B2 and then can be served at either of the two barbers at \&tep 83 . The process ends for att custsmers at thep B4, The numbert in parentheses indicate the minuses e takes that actwity to procoss a chatomet a. How long does it take the average cuntoener to complete this process? minutes. (Enter you response counded th one deomal place) b. What single activiy a the botseneck tor the enire process? E c. How many cussomers can this peocess serve in an hour? customees per hour (Enter your mespome as an integer)