In an effort to improve the quality of dining services, the Dean's Office hired an independent firm to conduct a comprehensive investigation of the university's dining halls. In one of the reports, it was shown that the time between a placing an order and receiving the order at Bertholf Commons averaged 2.78 minutes. Let X represent this waiting time. a) What is the standard deviation of X? b) Find P(X < 2.78). c) Find P(X 2 5). ww ww

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