anonymous
  • anonymous
1. An animal clinic kept record of the life spans of certain poodles. The number of years the dogs lived are 8, 10, 12, 15, 17, and 13. What is the standard deviation of the poodle life spans?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
do you know the standard deviation formula?
anonymous
  • anonymous
it should be around the sqrt(102/10)
anonymous
  • anonymous
whats the formula

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anonymous
  • anonymous
phinx828--go back to the other question
yuki
  • yuki
to find the SD, you need to know the formula \[\sqrt({1 \over n} \sum {(x*-x_i)^2})\]
anonymous
  • anonymous
sqrt(107/10)*
anonymous
  • anonymous
Here!
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anonymous
  • anonymous
thats confusing, i never saw that formula
yuki
  • yuki
usually the steps are as follows 1), find x* which is the mean 2), list the square of mean deviations in your case, x*-8, x*-10, x*-12 ...etc 3), square each numbers you got in the list (x*-8)^2, (x*-10)^2, ... etc 4), add them up 5), divide them by the number of #s, in your case since you have 6 numbers, divide by 6 at this step, you will get a number called the "variant" SD is defined as the square root of the variant, so 6), square root the number you got
yuki
  • yuki
rosette, do you need explanation how the formula works ?
anonymous
  • anonymous
no

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