love_to_love_you
  • love_to_love_you
Please help will fan and medal
Mathematics
schrodinger
  • schrodinger
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love_to_love_you
  • love_to_love_you
The test scores for a math class are shown below. 83, 85, 82, 93, 83, 84, 95, 87, 86, 94 What is the standard deviation of the data set? 4.7
love_to_love_you
  • love_to_love_you
@jim_thompson5910 I need help againnn same type of problem
jim_thompson5910
  • jim_thompson5910
first you need to find the mean mean = add up all the numbers then divide by 10

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love_to_love_you
  • love_to_love_you
87.2?
love_to_love_you
  • love_to_love_you
jim_thompson5910
  • jim_thompson5910
yes
jim_thompson5910
  • jim_thompson5910
now subtract the mean from each data value make a new column of these values
love_to_love_you
  • love_to_love_you
like subtract 87.2 from 83 and all the others?
jim_thompson5910
  • jim_thompson5910
yes like 83 - 87.2 = -4.2, and the same for the others
love_to_love_you
  • love_to_love_you
83, 85, 82, 93, 83, 84, 95, 87, 86, 94 --------------------------------- -4.2, -2.2, -5.2, 5.8, -4.2, -3.2, 7.8, -0.2, -1.2, 6.8
jim_thompson5910
  • jim_thompson5910
square each of those values
love_to_love_you
  • love_to_love_you
17.64, 4.84, 27.04, 33.64, 17.64, 10.24, 60.84, 0.04, 1.44, 46.24
jim_thompson5910
  • jim_thompson5910
now add up all of those values
love_to_love_you
  • love_to_love_you
219.6
jim_thompson5910
  • jim_thompson5910
divide that by 10 to get 21.96
jim_thompson5910
  • jim_thompson5910
then take the square root of that to get the standard deviation
jim_thompson5910
  • jim_thompson5910
this is considered the population standard deviation
love_to_love_you
  • love_to_love_you
Thank you!
jim_thompson5910
  • jim_thompson5910
yw
love_to_love_you
  • love_to_love_you
I have one last question but I don't really have time to do it so could you just show me this one?
love_to_love_you
  • love_to_love_you
In triangle RST angle S is a right angle and csc R = 17/15. What is tan T? 8/15
jim_thompson5910
  • jim_thompson5910
well if you don't have time, then you can come back later and I can help out
love_to_love_you
  • love_to_love_you
Can we work through it quickly right now?
jim_thompson5910
  • jim_thompson5910
|dw:1433474348886:dw|
jim_thompson5910
  • jim_thompson5910
csc R = 17/15 |dw:1433474389882:dw| since csc = hyp/opp
jim_thompson5910
  • jim_thompson5910
find the length of leg SR and that will help you determine tan(T)
jim_thompson5910
  • jim_thompson5910
|dw:1433474448784:dw|
love_to_love_you
  • love_to_love_you
8?
love_to_love_you
  • love_to_love_you
jim_thompson5910
  • jim_thompson5910
yep 8
love_to_love_you
  • love_to_love_you
ok
jim_thompson5910
  • jim_thompson5910
then you use tan = opp/adj
love_to_love_you
  • love_to_love_you
Thank you!!!
jim_thompson5910
  • jim_thompson5910
yw

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