The score John must have on his final exam in order to finish the class with an average of at least 90% is 62%.
In order to determine the score the that John must have in order to make an average of at least 90%, we have to determine the total sum of the scores he already has.
Sum of scores he already has = 87% + 95% + 92% + 89% + 84% = 447
Sum of scores he must have at the end of his sixth test = Average he must have on his average at the end of his final exam x number of exams written. 90 x 6 = 540
In order to determine the score John must have subtract 447 from 540. Divide the answer by 1.5.
540 - 447 = 93%
93 / 1.5 = 62%
A similar question was answered here: https://brainly.com/question/8709135?referrer=searchResults
A similar question was answered here:
