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anonymous

  • 4 years ago

Elementary Statistics the histogrgram shows the distance of hurricanes that have hit the U.S. mainland by category, with 1 the weakest level and five the strongest. *find (a) mean (b)variance (c) standard deviation (d) expected value of the probablity distribution x= 1 2 3 4 5 P(x)=.399 .264 .260 .066 .011

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  1. anonymous
    • 4 years ago
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    a. OK, so the mean is the average, so start with finding the average of the five data points. what do you get?

  2. anonymous
    • 4 years ago
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    1

  3. anonymous
    • 4 years ago
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    is the mean right??

  4. anonymous
    • 4 years ago
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    Well, you got the first step write. Now you have to divide 1 by 5 to get the average

  5. anonymous
    • 4 years ago
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    so it will be 0.2

  6. anonymous
    • 4 years ago
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    yep! so now the variance. The average of the squared differences from the Mean. To calculate the variance follow these steps: Work out the Mean (0.2) Then for each number: subtract the Mean and square the result (the squared difference). Then work out the average of those squared differences.

  7. anonymous
    • 4 years ago
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    o ok

  8. anonymous
    • 4 years ago
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    so (.399-.2)^2 + (.264-.2)^2 +... and then divide it all by 5.

  9. anonymous
    • 4 years ago
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    While you work on that, I'm going to go eat dinner (also while the site restarts)

  10. anonymous
    • 4 years ago
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    ok thank you for helping

  11. anonymous
    • 4 years ago
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    I'll check back when I'm done to see if you need help

  12. anonymous
    • 4 years ago
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    OK, how are you doing now?

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