anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
a. OK, so the mean is the average, so start with finding the average of the five data points. what do you get?
anonymous
  • anonymous
1
anonymous
  • anonymous
is the mean right??

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anonymous
  • anonymous
Well, you got the first step write. Now you have to divide 1 by 5 to get the average
anonymous
  • anonymous
so it will be 0.2
anonymous
  • anonymous
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.
anonymous
  • anonymous
o ok
anonymous
  • anonymous
so (.399-.2)^2 + (.264-.2)^2 +... and then divide it all by 5.
anonymous
  • anonymous
While you work on that, I'm going to go eat dinner (also while the site restarts)
anonymous
  • anonymous
ok thank you for helping
anonymous
  • anonymous
I'll check back when I'm done to see if you need help
anonymous
  • anonymous
OK, how are you doing now?

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