t (minutes) 0 5 10 15 R(t) (people per minute) 100 100 75 55 55 55 5. During an evacuation drill, people leave a building at a rate of R(t) people per minute, where t is the number of minutes since the start of the drill. Selected values of R(t) are shown in the table above. Using a right Riemann sum with three subintervals and data from the table, what is the approximation of the number of people who leave the building during the first 15 minutes of the evacuation drill? (A) 230 (B) 1150 (C) 1375 (D) 2075

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