Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Probability Dist.


What is random variable x numerical value associated with each outcome of a probability experiment
what is a discrete variable? finite or countable # of outcomes
what is a continuous variable? uncountable # of outcomes, represented by an interval on a number line. Example: Age, Height, Weight
what are the discrete probability distribution conditions? 0 < or = to P(x) < or = to 1 SUM P(x)=1
What are the 2 steps in constructing a discrete probability distribution ? 1. make freq. dist. for possible outcomes 2. SUM F 3. find probability of each outcome [P(f)] by F/(SUM F) 4. Check work. All add up to 1?
what is the formula to find the mean of the discrete random variable u=E[x*P(x)]
what is the formula to find the variance of a discrete random variable? o^2=E[(x-u)^2P(x)]
what is the formula to find the standard deviation of a discrete random variable? o=sq rt o^2 =sq rt E[(x-u)^2P(x)]
What is the formula to find the expected value of a discrete random variable? E(x)=u=E[x*P(x)]
At a raffle, 1,500 tickets are sold at $2 each for 4 prizes of $500, $250, $150, & $75. You buy one ticket. What is the expected value of your gain? -$1.35: Because the expected value is neg, you can expect to lose an average of $1.35 for each ticket you buy.
Created by: 100001455498513