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(77+83+89+86+x)/5=85

(335+x)/5=85

(335+x)=85*5

335+x=425

x=425-335

x=90

He must get 90% on his fifth test to average 85%.

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How do you convert percentile into percentage?

Into what kind of percentage do you want to convert it? A percentile already is some kind of percentage. It says that so-and-so many percent score above (or below) your score (or whatever score you are considering). The actual score (percentage or otherwise) can't be deduced from the percentile, unless you look it up in a table of scores. For example, if you are in the top 20 percentile in an exam, and there are 1000 students, get a list of the scores - sorted from high to low - and count the first 20% of scores - in this example, the scores for the best 200 students. The student at position #200 will be the answer.


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To find the percent difference between two numbers, you first calculate the absolute difference between the two numbers. In this case, the absolute difference between 1419 and 1286 is 133. Next, you divide this absolute difference by the average of the two numbers (1352.5) and multiply by 100 to get the percent difference. Therefore, the percent difference between 1419 and 1286 is approximately 9.82%.


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To calculate the Percent to Plan, you can first substitute the variable X for the percent and the variable Y for the Plan, and then you can solve for the end rate of percent to plan easily.

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