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chocolatechip_543
Group Title
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.
 2 years ago
 2 years ago
chocolatechip_543 Group Title
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.
 2 years ago
 2 years ago

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telliott99 Group TitleBest ResponseYou've already chosen the best response.0
http://math.elon.edu/statistics112/prob_dist.html
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
\[s2 = Σ ( x _{I}  x )2 / ( n  1 )\]
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
are you there??
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
yes
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
can you explain the equation a bit?
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
sure lets star with \[\sum_{i=1}^{n}\]
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
do you understand what this means?
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
yes
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
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= \[xbar=\sum_{i=1} x _{i}/n\]
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
we are assuming that you have sample and not population as well !!!!
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
alright..I'm a little lost now
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
tell me where.
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
at the last part you posted
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
"we are assuming that you have sample and not population as well" that
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
yes and before that
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
look. inorder to help you you need to be clear as to where are you not understanding . so i can help you better. thanks
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
I'm sorry, I just don't understand it.
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
no need to be sorry . :)
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
have you done statistics before ?
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
no, but this is in my algebra 2 work
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
thats cool/
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
do you now how to get the mean?
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
yes
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
ok so were half way.
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
lets talk concept first. is that ok?
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
sure
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
variance is the distance from the mean measured in squares. dw:1343956195413:dw
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
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.
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
s2=Σ(xI−x)2/(n−1) thats what this formula say.
 2 years ago

chocolatechip_543 Group TitleBest ResponseYou've already chosen the best response.0
oh alright
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
share what your thinking if you like?
 2 years ago

hal_stirrup Group TitleBest ResponseYou've already chosen the best response.2
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
 2 years ago
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