You have a mean score of 86 on 9 quizzes. The teacher decides to drop your lowest quiz score to determine your final quiz mean. After dropping the lowest score, your mean score on the 8 remaining quizzes is 88. What score was dropped?

let the score that was dropped be x

total of all the marks on 9 quizzes = 86*9 = 774
then (774-x)/8 = 88
solve for x

(hope you get 70)

sum/9 = 86

sum = 9*86 = 774
(sum - x)/8 = 88
sum - x = 704
774 - x = 704
x = 774 - 704
x = 70

Giovanni knows that 16/25 of his classmates are females. what percentage of his classmates are females.

To determine the score that was dropped, we can first find the sum of your scores on the 9 quizzes. We know that the mean score is calculated by dividing the sum of the scores by the number of quizzes.

Mean score = Sum of scores / Number of quizzes

Therefore, 86 = Sum of scores / 9

To find the sum of scores, we can multiply the mean score by the number of quizzes:

Sum of scores = Mean score * Number of quizzes
Sum of scores = 86 * 9
Sum of scores = 774

Now, since the lowest score is dropped, we need to find the sum of your scores on the remaining 8 quizzes. We know that the new mean score is 88, so we can calculate the sum using the same formula:

Mean score = Sum of scores / Number of quizzes

Therefore, 88 = Sum of scores / 8

To find the sum of scores, we can multiply the mean score by the number of quizzes:

Sum of scores = Mean score * Number of quizzes
Sum of scores = 88 * 8
Sum of scores = 704

Since the sum of scores after dropping the lowest score is 704, and the initial sum of scores was 774, we can find the score that was dropped by subtracting the two:

Score that was dropped = Initial sum of scores - Sum of scores after dropping
Score that was dropped = 774 - 704
Score that was dropped = 70

Therefore, the score that was dropped was 70.