A father notes that when his teenage daughter uses the telephone, she takes not less than 6 minutes for a call and som? times as much as an hour. Fifteen minutes call are more frequent than calls of any other duration. If these phone calls were an activity in PERT project, then phone calls expected duration will be_______________?
(A) 15 minutes
(B) 20.143 minutes
(C) 21 minutes
(D) 27 minutes
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