A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

The following table shows the probability of rolling the numbers 1 through 7 on a fair seven-sided die. X 1 2 3 4 5 6 7 P(X) 1/7 1/7 1/7 1/7 1/7 1/7 1/7 What is the standard deviation of the random variable X, "the number that comes up on the die?"

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1/7 ? im not sure about deviation

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lol me neither...but i know its a decimal i forgot how to do the work for this...

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    nvmmmm its 2.0 ! gah..

  4. shadowfiend
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    It's kind of a pain, but to find the standard deviation you have to square the difference of each point to the mean, then find the mean of those numbers, and finally take the square root. I think in this case we would see a mean of 4 ((1+2+3+4+5+6+7)/7). So you'd square 1-4, 2-4, 3-4, 4-4, etc, then add those up and divide by 7 to find their mean, then take the square root of that (which will indeed get you 2).

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I remember now! Thanks

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.