The monthly sales (in millions of units) of snow blowers can be modeled by the equation S = 19 + 4 sin pi(t-8)/6,   0 ≤ t ≤ 12,   where t is the time in months, with t = 0 corresponding to the beginning of January. (Round your answers to one decimal place.)   (a) Find the average monthly sales during a year.   million units (b) Find the average monthly sales from July through December.  million units

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