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In an exam, I guess. The percentile (as opposed to the percent) depends not only on your own performance, but also on the performance of other students. 80 percentile means that your grade is better than that of 80% of the other students.

Q: How many correct answers in mat gives 80 percentile?

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16 of them.

There are infinitely many answers but the simplest is probably 44+0 = 44.

You can get 60 questions wrong, which leaves you with 140 answers correct, giving you 70%.

It means that a problem has an infinite number of correct answers. This could mean that there are no incorrect answers at all or that infinitely many correct answers alternate with groups of incorrect answers. An example equation of the first type is 3x + 23 = 3x + 23, in which all possible values of x are correct from -infinity to +infinity. An example equation of the second type is sin(x) = 0, in which the infinite set of numbers {..., -pi, -pi/2, 0.0, pi/2, pi, ...) are correct but the numbers between members of that set are incorrect.

80% = 0.80.8 x 50 = 40

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16 of them.

all answers are correct

You would need to know how many questions were on the original test and what number of questions correct would be in the 8.6 percentile. Most tests do not give this data. If you can find it out, then number right / total number on test x 100 gives the percentage. 50 percentile might mean a 70% if it was an average test, or for a hard test 10 percentile might mean a 30%. Without the above information you cannot directly convert one to the other.

You would need to know how many questions were on the original test and what number of questions correct would be in the 8.6 percentile. Most tests do not give this data. If you can find it out, then number right / total number on test x 100 gives the percentage. 50 percentile might mean a 70% if it was an average test, or for a hard test 10 percentile might mean a 30%. Without the above information you cannot directly convert one to the other.

All of the answers are correct

Mixture? There are many correct answers to this question.

Presumably 14.

The answers are provided by many hundreds of WikiAnswers users, and there are many thousands that have accurate answers. If you are in doubt about any answer, please research the material. The answers are not always 100% correct.

It depends on what is passing. If 60% is passing, you need 60 correct answers. If 65% is passing, you need 65 correct answers. If 70% is passing, you need 70 correct answers.

is it 9/10 x 40=36

You need 18 correct answers to get 72 % 17 correct is only 68 %

80% of 20 = 20*80/100 = 16