Question

the math test scores were: 50,65,70,72,72,78,80,82,84,84,85,86,88,88,90,94,96,98,98,99 . find the percentile rank for a score of 84 on the test

Answer 1

@Hero could u help me

Answer 2

could u help

Answer 3

Hint:

\(\large P = \frac{100(r - .5)}{n}\)

r = order of rank
n = number of students

Answer 4

@annej

Answer 5

ok i got 422.5

Answer 6

is that correct

Answer 7

when u say order of rank what do you mean

Answer 8

@Hero

Answer 9

You can't get a percentile of 422.5

Answer 10

oh ok jk then

Answer 11

It has to be between 0.1% - 99%

Answer 12

Order of rank will be from lowest to greatest

Answer 13

so the median

Answer 14

1. 50
2. 65
3. 70
4. 72
4. 72
6. 78
7. 80
...

Answer 15

the students who scored 84 have a rank of 9, therefore r = 9 and n = 20, so: \[ \large P = \frac{100(9 - .5)}{20}\]

Answer 16

Ha, it's 42.5%

Answer 17

where did the 9 come from ???

Answer 18

9th ranked score

Answer 19

I'm curious as to how you calculated it

Answer 20

I used the given formula. What did you use?

Answer 21

i used what my teacher gave me

Answer 22

Which is...?

Answer 23

so if im trying to find the percentile score of 86 with the same data set , the rank would change

nxk/100

Answer 24

And what is k?

Answer 25

the required percentile

Answer 26

@Hero

Answer 27

ok so will the rank always be 9

Answer 28

No, the rank will not always be 9

Answer 29

Did you read what I posted above?

Answer 30

yes but i still dont get how u dont 9 because when i count the number lower that 84 i get 8

Answer 31

do i still count 84
even if it repeats

Answer 32

@Hero

Answer 33

Well....If you look at what I posted above, you'll see what happens when numbers repeat.

Answer 34

ok so if it where the perceptional rank of a score of 86 would the answer be 57.5

Answer 35

@Hero

Answer 36

plz just answer this last question

Answer 37

Yes, you have it figured out

Answer 38

ok thank you