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chocolatechip_543
 3 years 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.
chocolatechip_543
 3 years 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.

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

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

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

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

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

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

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

chocolatechip_543
 3 years ago
Best ResponseYou've already chosen the best response.0at the last part you posted

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

chocolatechip_543
 3 years ago
Best ResponseYou've already chosen the best response.0yes and before that

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

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

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

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

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

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

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

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

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

hal_stirrup
 3 years ago
Best ResponseYou've already chosen the best response.2in 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.

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

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

hal_stirrup
 3 years ago
Best ResponseYou've already chosen the best response.2if 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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