Question 3 (1 point) Let the function M(t) denote the mass of bacteria culture (in mg) at time t days. The average rate of change of M(t) is 1.4 mg/day over the time interval [1, 6] and is 0.6 mg/day over the time interval [5, 6]. The average rate of change of M(t) over the time interval [1, 5] is of mg / day 84 mg / day mg / day 12 mg / day 3 mg / day