Saylilbaby
  • Saylilbaby
help pls
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Saylilbaby
  • Saylilbaby
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Saylilbaby
  • Saylilbaby
@jim_thompson5910 @Compassionate @Kainui
jim_thompson5910
  • jim_thompson5910
where are you stuck?

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Saylilbaby
  • Saylilbaby
i havent started @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
so you're not sure what \(\Large \bar{x}\) means ?
Saylilbaby
  • Saylilbaby
im not sure how to do anything... this is a summer class i havent learned anything from this...this is a class to get a credit @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
\[\Large \bar{x}\] means xbar, this is the sample mean
jim_thompson5910
  • jim_thompson5910
you add up all the numbers in the sample and then divide by the number of numbers
jim_thompson5910
  • jim_thompson5910
so you have to first go through the graph given to you and pull out all of the data values
anonymous
  • anonymous
Each one of the dots represents an amount of numbers in the set. So if a 60 had 2 dots on it, you would have 2 60's in the sequence. (60, 60, ... ) so continue doing that for all the numbers
Saylilbaby
  • Saylilbaby
is number 1 80? @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
you're asking about the sample mean being 80? or something else?
Saylilbaby
  • Saylilbaby
im asking is number 1 80 or 191.47619 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
the mean isn't either of those values
Saylilbaby
  • Saylilbaby
well can u help @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
did you get these values 60,61,63,65,68,68,68,69,69,70,70,72,74,76,76,76,78,79,80,80,80,80,82,82,82,82,84,85,85,86,86,86,87,88,89,90,90,90,90,90,92,92,92,92,95,95,95,98,99,100 ??
jim_thompson5910
  • jim_thompson5910
there are 50 numbers in that list above (each one pulled from each dot)
Saylilbaby
  • Saylilbaby
yes
Saylilbaby
  • Saylilbaby
80.42 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
when you added all of the 50 numbers up, what did you get?
Saylilbaby
  • Saylilbaby
4021 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
you made an error, it should be larger than 4021
Saylilbaby
  • Saylilbaby
4176 and when divided by 50 i got 83.52 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
4176 is too high
Saylilbaby
  • Saylilbaby
thats wat i keep getting @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
60+61+63+65+68+68+68+69+69+70+70+72+74+76+76+76+78+79+80+80+80+80+82+82+82+82+84+85+85+86+86+86+87+88+89+90+90+90+90+90+92+92+92+92+95+95+95+98+99+100 = 4,086
Saylilbaby
  • Saylilbaby
so 81.72 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
yes that is xbar
Saylilbaby
  • Saylilbaby
ok wat about number 2 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
use something like this https://www.easycalculation.com/statistics/standard-deviation.php
jim_thompson5910
  • jim_thompson5910
type in all the numbers separated by commas
Saylilbaby
  • Saylilbaby
ok i did now wat am i looking for in number 2 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
do you see where it says Standard deviation 10.47259
Saylilbaby
  • Saylilbaby
yes @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
thats the answer to 2
Saylilbaby
  • Saylilbaby
3 4 and 5 @jim_thompson5910 wat i do
jim_thompson5910
  • jim_thompson5910
xbar will be used in place of \(\Large \mu\) the standard deviation is \(\Large \sigma\)
jim_thompson5910
  • jim_thompson5910
what you need to do is compute 81.72 - k*10.47259 for k = 1, k = 2, and k = 3 also compute 81.72 + k*10.47259 for k = 1, k = 2, and k = 3

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