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ErinWeeks
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Help would be appreciated (:
Find the values of the 30th and 90th percentiles of the data. 129, 113, 200, 100, 105, 132, 100, 176, 146, 152
A. 30th percentile = 105; 90th percentile = 200
B. 30th percentile = 113; 90th percentile = 200
C. 30th percentile = 105; 90th percentile = 176
D. 30th percentile = 113; 90th percentile = 176
 2 years ago
 2 years ago
ErinWeeks Group Title
Help would be appreciated (: Find the values of the 30th and 90th percentiles of the data. 129, 113, 200, 100, 105, 132, 100, 176, 146, 152 A. 30th percentile = 105; 90th percentile = 200 B. 30th percentile = 113; 90th percentile = 200 C. 30th percentile = 105; 90th percentile = 176 D. 30th percentile = 113; 90th percentile = 176
 2 years ago
 2 years ago

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ErinWeeks Group TitleBest ResponseYou've already chosen the best response.0
@jim_thompson5910 .. do you know this ?
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
First sort the values 129, 113, 200, 100, 105, 132, 100, 176, 146, 152 becomes 100, 100, 105, 113, 129, 132, 146, 152, 176, 200
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
The 30th percentile is the point where 30% of the data is below that value
 2 years ago

ErinWeeks Group TitleBest ResponseYou've already chosen the best response.0
but them in order . okay ! i did that part . & what does that mean ?
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
So if you have say 100 values, then 30% of that (0.3*100 = 30 values) are below the 30th percentile
 2 years ago

ErinWeeks Group TitleBest ResponseYou've already chosen the best response.0
so in this case we have 10 right .
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
yes, I'm looking up a percentile formula now, one sec
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
hmm there are multiple percentile formulas, so it depends on what your book says...do you have your book with you?
 2 years ago

ErinWeeks Group TitleBest ResponseYou've already chosen the best response.0
yes let me look quick !
 2 years ago

ErinWeeks Group TitleBest ResponseYou've already chosen the best response.0
my book doesnt have a formula .. it just says percentiles : seperate data sets into 100 equal parts
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
well i found one formula to be n = (P/100)*N + 1/2 So the 30th percentile is at... n = (30/100)*10 + 1/2 n = 300/100 + 1/2 n = 3 + 1/2 n = 3.5 which rounds to n = 4, so the 4th value (which is 113) is the 30th percentile
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
If we use the same formula for the 90th percentile, then... n = (P/100)*N + 1/2 So the 30th percentile is at... n = (90/100)*10 + 1/2 n = 900/100 + 1/2 n = 9 + 1/2 n = 9.5 which rounds to 10 so the 10th value, which is 200, is the 90th percentile
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
so if we're using the correct formula (I hope we are), then the answer is B. 30th percentile = 113; 90th percentile = 200
 2 years ago

ErinWeeks Group TitleBest ResponseYou've already chosen the best response.0
okay i get that ! (: thank you so much
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
let me know if it's the right answer or not
 2 years ago

mushinni Group TitleBest ResponseYou've already chosen the best response.1
yup, you were right :)
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.6
thanks for the confirmation
 one year ago

mushinni Group TitleBest ResponseYou've already chosen the best response.1
thanks for explaining :)
 one year ago
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