
                ### Instruction: help me answer this question For Group A, find the mid-point and Yi?, think step by step
                ### Assistant: The mid-point (Xi) for each class is calculated by adding the lower and upper limits of each class and dividing by 2. For Group A, the first class is 10-20, so the mid-point (Xi) is (10 + 20)/2 = 15.
Yi is calculated as Yi = (xi – A)/h, where A is the assumed mean and h is the class size. For Group A, h is 10. The value of A is usually the mean of the data or a value close to it. For example, if we assume A = 45, then Yi for the 10-20 class is Yi = (10 - 45)/10 = -3. , The answer is The mid-point (Xi) for Group A can be calculated by adding the lower and upper limits of each class and dividing by 2. For example, the mid-point for the 10-20 class is (10 + 20)/2 = 15.
Yi is calculated as Yi = (xi – A)/h, where A is the assumed mean and h is the class size. For Group A, h is 10. The value of A is usually the mean of the data or a value close to it.
