Weighted Sums and Averages Question:

After the first three grading periods, John's math grades were 96, 93, and 90, which means his average grading period grade is 93. John thinks he can find the mean for the entire year by finding the mean of his 4" grading period grade, a 97, and the overall 93 average. Is this a correct way for John to find his mean for the entire year? A. Yes, using the 93 average to represent all of his grades to this point and finding the mean of 93 and 97 will give him the final average. B. Yes, using the mean score to find a second mean score is okay. C. No, the mean score of the first three grading periods cannot be used because it has been miscalculated. D. No, the 93 has to be counted three times with the 97 to find the overall average