A rain gauge is set up to measure the amount of total Time, t Rainfall rate, r(t) in mm/hr rainfall occurring in 1 hr on campus (the readout from the rain gauge is in mm/hr). The total amount of rainfall 6 QUI AWN - O OOAARON between t= 0 and t.= 6 is given by |r(t)dt. Assume the 0 data to the right is collected in a 6-hour window. Use this information to answer parts (a) and (b) below. . . . (a) Use six even subintervals to approximate the total rainfall between t = 0 and t= 6 as a sum of areas of rectangles and evaluate this sum using the data in the table. The total rainfall using six even subintervals is approximately | mm