What is the minimum rating that the 16^th customer of the shop gives to a new product launched by the company at the store,if the feedback ratings from 15 customers on a scale of 20 to 120 has an average rating of 78, and overall average rating from 16 customers for the product is at least 80?

To find the minimum required rating, use the fundamental average formula to calculate the total score needed for 16 customers, which is 16 multiplied by 80, giving 1280. The total score of the first 15 customers is 15 multiplied by 78, equaling 1170. The difference between the required total and the current total is 1280 minus 1170, which is 110. Therefore, the 16th customer must give a minimum rating of 110.

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