If the standard deviation of a distribution is 9, then the variance of the distribution is?

5 Answers

Relevance
  • 9 months ago

    S.D. = 9

    Var = sqrt(9) = 3

    • Commenter avatarLogin to reply the answers
  • 9 months ago

    Remember the relationship between variance and standard deviation.

    s.d. = √var

    In your case, the standard deviation is 9, so the variance must be 81. If it unclear, you can write the equation above as:

    var = (s.d.)²

    When you calculate standard deviation by hand, you usually go through the steps and end up with the variance. Then the last step is to take the square root to get the standard deviation. Having done this many times, I don't even have to think to know that if the standard deviation is 9, I must have calculated a variance of 81.

    • Commenter avatarLogin to reply the answers
  • 9 months ago

    variance = standard deviation squared = 9^2 = 81

    • Commenter avatarLogin to reply the answers
  • Mike G
    Lv 7
    9 months ago

    81

    *******************************************

    • Commenter avatarLogin to reply the answers
  • How do you think about the answers? You can sign in to vote the answer.
  • 9 months ago

    It's 81. The standard deviation is the square root of the variance, so variance is the square of standard deviation. 9^2 = 81.

    • Commenter avatarLogin to reply the answers
Still have questions? Get your answers by asking now.