The sales S (in thousands of units) of a seasonal product are given by the model below, where t is the time in months, with t = 1 corresponding to January. Find the average sales for each time period. (Round your answers to two decimal places.) S = 74.06 + 43.93 sin t 6 (a) The first quarter (0 ≤ t ≤ 3) Incorrect: Your answer is incorrect. thousand units (b) The second quarter (3 ≤ t ≤ 6) Incorrect: Your answer is incorrect. thousand units (c) The entire year (0 ≤ t ≤ 12) 74.06 Correct: Your answer is correct. thousand units