anonymous
  • anonymous
The following table shows the probability distribution for a discrete random variable. X 13 16 18 21 23 25 26 31 P(X) 0.07 0.21 0.17 0.25 0.05 0.04 0.13 0.08 The mean of the discrete random variable X is 20.59. What is the variance of X? Round your answer to the nearest hundredth.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
http://math.elon.edu/statistics112/prob_dist.html
anonymous
  • anonymous
\[s2 = Σ ( x _{I} - x )2 / ( n - 1 )\]
anonymous
  • anonymous
are you there??

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anonymous
  • anonymous
yes
anonymous
  • anonymous
can you explain the equation a bit?
anonymous
  • anonymous
sure lets star with \[\sum_{i=1}^{n}\]
anonymous
  • anonymous
do you understand what this means?
anonymous
  • anonymous
yes
anonymous
  • anonymous
good then\[x_{i} -x\] xi is each value of your x value . -x really i cant use xbar because the keyboard is limited .. x bar is the average= \[xbar=\sum_{i=1} x _{i}/n\]
anonymous
  • anonymous
we are assuming that you have sample and not population as well !!!!
anonymous
  • anonymous
alright..I'm a little lost now
anonymous
  • anonymous
tell me where.
anonymous
  • anonymous
at the last part you posted
anonymous
  • anonymous
"we are assuming that you have sample and not population as well" that
anonymous
  • anonymous
yes and before that
anonymous
  • anonymous
look. inorder to help you you need to be clear as to where are you not understanding . so i can help you better. thanks
anonymous
  • anonymous
I'm sorry, I just don't understand it.
anonymous
  • anonymous
no need to be sorry . :)
anonymous
  • anonymous
have you done statistics before ?
anonymous
  • anonymous
no, but this is in my algebra 2 work
anonymous
  • anonymous
thats cool/
anonymous
  • anonymous
do you now how to get the mean?
anonymous
  • anonymous
yes
anonymous
  • anonymous
ok so were half way.
anonymous
  • anonymous
lets talk concept first. is that ok?
anonymous
  • anonymous
sure
anonymous
  • anonymous
variance is the distance from the mean measured in squares. |dw:1343956195413:dw|
anonymous
  • anonymous
in you r case you have many data points. so really your job is fine all the distance from the mean and then sum them up and divide by the number of data point and minus 1.
anonymous
  • anonymous
s2=Σ(xI−x)2/(n−1) thats what this formula say.
anonymous
  • anonymous
oh alright
anonymous
  • anonymous
share what your thinking if you like?
anonymous
  • anonymous
if you like to , be my fan and send my question and thoughts if you want and dont forget to click on best response . thanks @chocolatechip_543

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