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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

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  1. telliott99 Group Title
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    http://math.elon.edu/statistics112/prob_dist.html

    • 2 years ago
  2. hal_stirrup Group Title
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    \[s2 = Σ ( x _{I} - x )2 / ( n - 1 )\]

    • 2 years ago
  3. hal_stirrup Group Title
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    are you there??

    • 2 years ago
  4. chocolatechip_543 Group Title
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    yes

    • 2 years ago
  5. chocolatechip_543 Group Title
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    can you explain the equation a bit?

    • 2 years ago
  6. hal_stirrup Group Title
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    sure lets star with \[\sum_{i=1}^{n}\]

    • 2 years ago
  7. hal_stirrup Group Title
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    do you understand what this means?

    • 2 years ago
  8. chocolatechip_543 Group Title
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    yes

    • 2 years ago
  9. hal_stirrup Group Title
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    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
  10. hal_stirrup Group Title
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    we are assuming that you have sample and not population as well !!!!

    • 2 years ago
  11. chocolatechip_543 Group Title
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    alright..I'm a little lost now

    • 2 years ago
  12. hal_stirrup Group Title
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    tell me where.

    • 2 years ago
  13. chocolatechip_543 Group Title
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    at the last part you posted

    • 2 years ago
  14. hal_stirrup Group Title
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    "we are assuming that you have sample and not population as well" that

    • 2 years ago
  15. chocolatechip_543 Group Title
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    yes and before that

    • 2 years ago
  16. hal_stirrup Group Title
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    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
  17. chocolatechip_543 Group Title
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    I'm sorry, I just don't understand it.

    • 2 years ago
  18. hal_stirrup Group Title
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    no need to be sorry . :)

    • 2 years ago
  19. hal_stirrup Group Title
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    have you done statistics before ?

    • 2 years ago
  20. chocolatechip_543 Group Title
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    no, but this is in my algebra 2 work

    • 2 years ago
  21. hal_stirrup Group Title
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    thats cool/

    • 2 years ago
  22. hal_stirrup Group Title
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    do you now how to get the mean?

    • 2 years ago
  23. chocolatechip_543 Group Title
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    yes

    • 2 years ago
  24. hal_stirrup Group Title
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    ok so were half way.

    • 2 years ago
  25. hal_stirrup Group Title
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    lets talk concept first. is that ok?

    • 2 years ago
  26. chocolatechip_543 Group Title
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    sure

    • 2 years ago
  27. hal_stirrup Group Title
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    variance is the distance from the mean measured in squares. |dw:1343956195413:dw|

    • 2 years ago
  28. hal_stirrup Group Title
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    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
  29. hal_stirrup Group Title
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    s2=Σ(xI−x)2/(n−1) thats what this formula say.

    • 2 years ago
  30. chocolatechip_543 Group Title
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    oh alright

    • 2 years ago
  31. hal_stirrup Group Title
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    share what your thinking if you like?

    • 2 years ago
  32. hal_stirrup Group Title
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    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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