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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.
 one year ago
 one year ago
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.
 one year ago
 one year ago

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telliott99Best ResponseYou've already chosen the best response.0
http://math.elon.edu/statistics112/prob_dist.html
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
\[s2 = Σ ( x _{I}  x )2 / ( n  1 )\]
 one year ago

chocolatechip_543Best ResponseYou've already chosen the best response.0
can you explain the equation a bit?
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
sure lets star with \[\sum_{i=1}^{n}\]
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
do you understand what this means?
 one year ago

hal_stirrupBest 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= \[xbar=\sum_{i=1} x _{i}/n\]
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
we are assuming that you have sample and not population as well !!!!
 one year ago

chocolatechip_543Best ResponseYou've already chosen the best response.0
alright..I'm a little lost now
 one year ago

chocolatechip_543Best ResponseYou've already chosen the best response.0
at the last part you posted
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
"we are assuming that you have sample and not population as well" that
 one year ago

chocolatechip_543Best ResponseYou've already chosen the best response.0
yes and before that
 one year ago

hal_stirrupBest 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
 one year ago

chocolatechip_543Best ResponseYou've already chosen the best response.0
I'm sorry, I just don't understand it.
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
no need to be sorry . :)
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
have you done statistics before ?
 one year ago

chocolatechip_543Best ResponseYou've already chosen the best response.0
no, but this is in my algebra 2 work
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
do you now how to get the mean?
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
ok so were half way.
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
lets talk concept first. is that ok?
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
variance is the distance from the mean measured in squares. dw:1343956195413:dw
 one year ago

hal_stirrupBest 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.
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
s2=Σ(xI−x)2/(n−1) thats what this formula say.
 one year ago

hal_stirrupBest ResponseYou've already chosen the best response.2
share what your thinking if you like?
 one year ago

hal_stirrupBest 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
 one year ago
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