use the z-table.

a standard score of 1.645 is the 90 percentile

a standard score of 1.96 is the 95 percentile

a standard score of -1.96 is the 5th percentile, etc

The pth percentile is a value p such that 90% of the data (or possible values) are less than or equal to p.

the CDF for the Standard Normal is the table you need to do this.

there is frequently a chart of a few variety it rather is in touch. as an occasion there is itemizing of the commonplace or uncooked score on one side nd the percentile scores in a vertical matching colulmn. A percentile is a extensive decision from final say a million -one hundred that provide you with the proportion that scored below you. think approximately for yet another occasion. commonplace score Percentile Rank 80 seventy 5 80 one seventy 5 80 two seventy six 80 3 seventy seven in this occasion somebody who scored 80 two became interior the 76th percentile which mans that seventy 5% who took tgis specific attempt scorfed below he did.

There’s no standard conversion method – what you need to do rank order the the students by score, and see what percentile they fall into. For instance, if you have 500 students, the top 25 students will be in the 95th percentile.

ex: 17 out of 67 students prefer chocolate

take 17/67 to get decimal .1492537313

use the first three digits of the decimal .149

multiuply by 100 to get percentage .149 *100 = 14.9%

ex: 18.3% students out of 93 students questioned feel that standarized testing is great.

take 18.3/100 to get .183

.183 x 93 = 17.01 appox 17 students

Good Luck

The format is (using students as in examples)

To find percentage

(amt / Total Amt) times 100 = percentage of students

To find number

(percentage of students / 100) total students

To see yor grade use

A = 90-100%

B = 80 -89%

C = 70-79%

D= 60 – 69%

F = 0 – 59%