if a student has an average of 8 after 20 tests and then gets a 0 on his 21st test, what would his new average be?
8 * 20 = 160
160/21 = ?
x = total score of tests
x/20 = 8
x = 160
160/21 = 7.62 new average
thank you.
To find the new average, you need to consider the cumulative score of all the tests.
First, let's calculate the cumulative score after 20 tests. Since the student's average is 8 after these 20 tests, the cumulative score is 8 multiplied by 20, which equals 160.
Now, we need to add the score of the 21st test, which is 0, to the cumulative score. After adding the 21st test score, the new cumulative score is 160 + 0 = 160.
To find the new average, divide the new cumulative score by the total number of tests, which is 21 now. Therefore, the new average is 160 divided by 21, which is approximately 7.62 (rounded to two decimal places).