Question

the following data gives the weight ( in pounds) lost by 15 members of a heath club at the end of two months after joining the club : 5 10 8 7 25 12 5 14 11 10 21 9 8 11 18
Calculate the (approximate) value of the 82nd percentile rank of 10.

Answer 1

the last part is suppose to say find the percentile rank of 10

Answer 2

@Callisto

Answer 3

so how exactly would i do this

Answer 4

Actually, I haven't learnt percentile rank ....
From what I've seen on the Net,
percentile rank
= (no. of data less than 10 + frequency of the datum10) / total number of data

Isn't it?

Answer 5

i have no clue . i just started learning it

Answer 6

I gave you the formula for this. How come you're not using it?

Answer 7

but what does the 82 percentile mean

Answer 8

http://regentsprep.org/Regents/math/ALGEBRA/AD6/quartiles.htm

Answer 9

\(\large P = \frac{100(r - 0.5)}{n}\)

r = order of rank
n = number of participants

Answer 10

2 formulas

Answer 11

If you're already given the percentile, input it into the formula. In this case
P = .82
r = 10

Solve for n

Answer 12

and that link I posted have percentiles and quartiles. it's from a HS regents review

Answer 13

thank you

Answer 14

thank hero. he's the one that helped.