Jennifer's scores on her first four science tests were 85, 76, 89 and 92.
What score must she make on the fifth test to have the mean of the five tests equal 85?
5 * 85 = 425
85 + 76 + 89 + 92 = 342
425 - 342 = ?
To find out what score Jennifer must make on the fifth test to have the mean of the five tests equal 85, we need to calculate the sum of her scores on the first four tests and then determine the fifth score.
Step 1: Add up the scores on the first four tests.
85 + 76 + 89 + 92 = 342
Step 2: Calculate the sum of all five tests.
To have the mean of the five tests equal 85, the sum of all the scores must be equal to 85 multiplied by the total number of tests (which is 5).
85 * 5 = 425
Step 3: Determine the score Jennifer must make on the fifth test.
To find the score Jennifer needs on the fifth test, subtract the sum of the first four scores from the desired sum of all five scores.
425 - 342 = 83
Therefore, Jennifer must make at least 83 on the fifth test to have a mean score of 85 across all five tests.