Average score is 63marks. If score of three tests were 54,48, and 78. Find the 4th score, if the 5th score exceed the 4th score by 25marks
To find the average score, you need to add up all the scores and divide them by the number of scores. In this case, the average score is 63. Let's denote the fourth score as x.
So, the sum of the first four scores is 54 + 48 + 78 + x. And the sum of all five scores is 63 multiplied by 5, which is 315.
We know that the fifth score exceeds the fourth score by 25 marks. Therefore, the fifth score is x + 25.
Now, we can set up an equation to solve for x:
(54 + 48 + 78 + x) + (x + 25) = 315
180 + 2x = 315
2x = 315 - 180
2x = 135
x = 135/2
x = 67.5
Therefore, the fourth score is 67.5.