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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
 one year ago
 one year ago
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
 one year ago
 one year ago

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ErinWeeksBest ResponseYou've already chosen the best response.0
@jim_thompson5910 .. do you know this ?
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
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
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
The 30th percentile is the point where 30% of the data is below that value
 one year ago

ErinWeeksBest ResponseYou've already chosen the best response.0
but them in order . okay ! i did that part . & what does that mean ?
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
So if you have say 100 values, then 30% of that (0.3*100 = 30 values) are below the 30th percentile
 one year ago

ErinWeeksBest ResponseYou've already chosen the best response.0
so in this case we have 10 right .
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
yes, I'm looking up a percentile formula now, one sec
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
hmm there are multiple percentile formulas, so it depends on what your book says...do you have your book with you?
 one year ago

ErinWeeksBest ResponseYou've already chosen the best response.0
yes let me look quick !
 one year ago

ErinWeeksBest 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
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
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
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
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
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
so if we're using the correct formula (I hope we are), then the answer is B. 30th percentile = 113; 90th percentile = 200
 one year ago

ErinWeeksBest ResponseYou've already chosen the best response.0
okay i get that ! (: thank you so much
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.5
let me know if it's the right answer or not
 one year ago

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

jim_thompson5910Best ResponseYou've already chosen the best response.5
thanks for the confirmation
 one year ago

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