Gini's test scores in Biology 30 are 95, 82, 76, and 88. What score must she get on the fifth test in order to achieve an average of 84 on all five tests?
84 * 5 = 420 total points needed
How many points does she have now?
How many more does she need?
Average = Sum of each test's marks/Number of tests
Taking x as the score on the fifth test,
=> 84 = (95+82+76+88+x)/5
=> 420 = 95+82+76+88+x
=> 420 = 341 + x
=> x = 79
To find out what score Gini needs on the fifth test in order to achieve an average of 84 on all five tests, we can use the formula for calculating an average.
The average is the sum of all the scores divided by the number of scores.
In this case, Gini has already taken four tests, so we need to find the sum of her scores on those tests.
95 + 82 + 76 + 88 = 341
Now, we need to find out how many total tests Gini will have taken once she takes the fifth test. Since she has already taken four tests, the total number of tests will be 4 + 1 = 5.
We know that the average of all five tests should be 84. So, we can set up the equation:
(341 + x) / 5 = 84
Where 'x' represents the score Gini needs to get on the fifth test.
To solve for 'x', we need to first multiply both sides of the equation by 5:
341 + x = 84 * 5
341 + x = 420
Next, we need to isolate 'x' by subtracting 341 from both sides of the equation:
x = 420 - 341
x = 79
Therefore, Gini needs to get a score of 79 on her fifth test in order to achieve an average of 84 on all five tests.