anonymous
  • anonymous
Statistics help?
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Grades can be converted into numbers (as in calculating a GPA) where an A = 4, B = 3, C = 2, D = 1, and F = 0. For a fictional class, the grade distribution was: X(Grade) 4 3 2 1 0 P(X) 0.20 0.25 0.30 0.10 0.15 a) Verify that this is a legitimate probability distribution. b) Find the mean grade for this class. c) Find the standard deviation
anonymous
  • anonymous
wrong section
anonymous
  • anonymous
openstudy has a stats section?

Looking for something else?

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

More answers

hartnn
  • hartnn
could u do part a) ?
anonymous
  • anonymous
yeah
anonymous
  • anonymous
at the top it will say "Find More Subjects"
anonymous
  • anonymous
yeah, I know part a. It's legitimate because the total probability is equal to 1.
hartnn
  • hartnn
good, thats correct. where r u stuck ?
anonymous
  • anonymous
Yeah its at the very bottom if you click on "Find More Subjects" at the top :))
anonymous
  • anonymous
finding the mean/sd. i found those out, but idk how to corrleate them with the grades. i know mean is .2, so would that mean the average grade is 4 because its' probability is .2?
anonymous
  • anonymous
oh, whoops. i didn't see that before. i'll go there next time.
hartnn
  • hartnn
mean is 0.2 ? which formula did u use ?
anonymous
  • anonymous
total is 1, divided by 5, .2? did i do that wrong?
hartnn
  • hartnn
yes... Mean = \(\sum xP(x)\) so, it will be mean = 0.2*4 + 0.25*3 + ......
anonymous
  • anonymous
oooh. okay. one sec. let me calculate that. :P
anonymous
  • anonymous
2.25?
hartnn
  • hartnn
don't u have answers to verify ?
hartnn
  • hartnn
yeah, even i get 2.25
anonymous
  • anonymous
nope. answers are given upon completion. :P
anonymous
  • anonymous
but thanks, I think I got it now. Wrong formula. :P
hartnn
  • hartnn
and u know formula for sd ?
anonymous
  • anonymous
yeah, got that. i compared that with a friend, and she got the same answer. it was just the mean.
hartnn
  • hartnn
ok, good :)
anonymous
  • anonymous
hartnn, if you don't mind could you explain how to find the standar deviation, i'm a bit confused on how to go about it.

Looking for something else?

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