Sometimes you see SD referred to as - in a journal article which is indicating the same thing. How to calculate average percentage. For example if there are 25 questions on a test and a student gets 22 of them correct then the test score percentage is 2225 100 88 percent.
50th Percentile Mean 84th Percentile Mean Standard Deviation 975th Percentile Mean 2 x Standard Deviation The percentile is the proportion of scores in a distribution where a specific score is greater than or equal to maximum number of scores.
This is another mean range of what other people are using. Convert Decimal to Percentage. Since 1 SD in our example is 840 and we know that the mean is 92 we can be sure that 68 of the scores on this test fall between 836 and 1004. With this formula you can easily calculate the average for the n number of sets.