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anonymous

  • 5 years ago

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?

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  1. anonymous
    • 5 years ago
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    do you know the standard deviation formula?

  2. anonymous
    • 5 years ago
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    it should be around the sqrt(102/10)

  3. anonymous
    • 5 years ago
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    whats the formula

  4. anonymous
    • 5 years ago
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    phinx828--go back to the other question

  5. Yuki
    • 5 years ago
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    to find the SD, you need to know the formula \[\sqrt({1 \over n} \sum {(x*-x_i)^2})\]

  6. anonymous
    • 5 years ago
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    sqrt(107/10)*

  7. anonymous
    • 5 years ago
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    Here!

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  8. anonymous
    • 5 years ago
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    thats confusing, i never saw that formula

  9. Yuki
    • 5 years ago
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    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

  10. Yuki
    • 5 years ago
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    rosette, do you need explanation how the formula works ?

  11. anonymous
    • 5 years ago
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    no

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