Final answer:
To find the average cost when producing 10 T-shirts, calculate the total cost and divide it by the number of T-shirts.
Step-by-step explanation:
To find the average cost when producing 10 T-shirts, we need to calculate the total cost and divide it by the number of T-shirts. The given total cost function is 11+3q², where q represents the quantity of T-shirts. Substituting q=10 into the function, we get 11+3(10)² = 11+3(100) = 11+300 = 311. So, the total cost of producing 10 T-shirts is 311. To find the average cost, we divide the total cost by the number of T-shirts produced: 311/10 = 31.1. Therefore, the average cost when producing 10 T-shirts is $31.1.