anonymous
  • anonymous
A random number generator picks a number from 1 to 9 in a uniform manner. Find the 90th percentile. (Round your answer to one decimal place.) My set up is (k-9)(1/8)=0.90 why is this wrong
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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nincompoop
  • nincompoop
why did you use that "set up?"
anonymous
  • anonymous
in my book it says to use it
anonymous
  • anonymous
(base)(height)=0.90

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nincompoop
  • nincompoop
first, what do you know about percentile rank in your own words
anonymous
  • anonymous
isn't it like how many # were chosen...90%?
nincompoop
  • nincompoop
so you're being asked for the number that ranks 90th percentile
anonymous
  • anonymous
right
nincompoop
  • nincompoop
how would you look for that number
anonymous
  • anonymous
that's where I am getting confused because my set up is wrong? would it be like 90%..of 9
nincompoop
  • nincompoop
let us list your numbers
nincompoop
  • nincompoop
is this how you have it set up? 1, 2, 3, 4, 5, 6, 7, 8, 9
anonymous
  • anonymous
okay yes
nincompoop
  • nincompoop
there are two ways to get percentile ranks one is: \(\sf \huge \frac{B\times (0.5E)}{n} \times 100 \) B: scores below x E: number of scores equal x n: total number the other is: \(\sf \huge \frac{B}{n} \times 100 \)
nincompoop
  • nincompoop
if you're going to use the second one, the set up should be \(\sf \large \frac{B}{9} \times 100 = 90 \) remember that your B will be lower than the actual score you're looking for, but let us focus on properly solving for B first
anonymous
  • anonymous
so it would be 8.1?
anonymous
  • anonymous
8?
anonymous
  • anonymous
I thought it ment to keep the .1
nincompoop
  • nincompoop
http://www.wolframalpha.com/input/?i=%28100*b%29%2F9+%3D+90
nincompoop
  • nincompoop
round off is the same as estimation and you need to learn about place values.
nincompoop
  • nincompoop
9.1 rounded off to 1 decimal means you focus on the first decimal if it is between 0-4 then it becomes 0 if it is between 5-9 then you add 1 to the number that preceded it 9.1 = 9 9.5 = 10 9.67 = 10 etcetera etcetera
nincompoop
  • nincompoop
let us check if our answer makes sense http://www.wolframalpha.com/input/?i=8%2F9
anonymous
  • anonymous
I understand that, but the question says "Round your answer to one decimal place" so therefore the answer would be like "9.4" keeping the 4
nincompoop
  • nincompoop
8 out 9 makes almost 90%
nincompoop
  • nincompoop
no
anonymous
  • anonymous
when I practice another problem with numbers 2-9 and asking for the 80th percentile, the answer is 7.6 ??
anonymous
  • anonymous
the .6 is kept
nincompoop
  • nincompoop
http://www.mathsisfun.com/rounding-numbers.html
nincompoop
  • nincompoop
you're right you keep it
anonymous
  • anonymous
so youre saying when it is smaller than .4 it is rounded to 0
nincompoop
  • nincompoop
but 1, 2, 3, 4, 5, 6, 7, 8, 9 tell me where is 8.1
anonymous
  • anonymous
so you're saying the answer is 8
nincompoop
  • nincompoop
in scores 1 - 9 and if they are just 1, 2 .... 9 then yes unless someone actually has a score of 8.1 then it is 8.1
anonymous
  • anonymous
so I tried 8.1 and 8 and it is saying it is wrong
nincompoop
  • nincompoop
how about the first formula
anonymous
  • anonymous
the one that I used? nope
nincompoop
  • nincompoop
I made a typo \(\huge \frac{(B + 0.5E )}{n} \times 100 \)
nincompoop
  • nincompoop
so 8.1 and 8.0 are wrong huh?
anonymous
  • anonymous
yes
nincompoop
  • nincompoop
did you put 8.0 with point?
anonymous
  • anonymous
no I just did 8
nincompoop
  • nincompoop
try 8.0 because of the 10th place value
nincompoop
  • nincompoop
did it work?
anonymous
  • anonymous
wait but I only have one try left so I would like to be really sure!
anonymous
  • anonymous
the book says 8.2??
nincompoop
  • nincompoop
I don't know what you just did in the end, kropot but I do want to know why 8.2 because I want to learn if there's any other methods of solving this.
anonymous
  • anonymous
I am really not sure. They give me an example of "random number generator picks a number from 2 to 9 in a uniform manner. Find the 80th percentile(Round your answer to one decimal place . and the answer is 7.6 I am trying to work backwards from the answer but I still do not know
dan815
  • dan815
(7.6-2)/(9-2)=0.8
dan815
  • dan815
using same method, (k-1)/(9-1)=0.9 k=?
dan815
  • dan815
k=8.2
anonymous
  • anonymous
ohohoh I see
anonymous
  • anonymous
thank you so much for this explanation!!!!
anonymous
  • anonymous
what was the equation you used tho?
dan815
  • dan815
i looked at the example they gave you
dan815
  • dan815
basically what they are doing is
dan815
  • dan815
|dw:1436852959460:dw|
dan815
  • dan815
and they gave you this example |dw:1436853055768:dw|

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