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anonymous
 3 years ago
Statistics help?
anonymous
 3 years ago
Statistics help?

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anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Grades 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
 3 years ago
Best ResponseYou've already chosen the best response.0openstudy has a stats section?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0at the top it will say "Find More Subjects"

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0yeah, I know part a. It's legitimate because the total probability is equal to 1.

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1good, thats correct. where r u stuck ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Yeah its at the very bottom if you click on "Find More Subjects" at the top :))

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0finding 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
 3 years ago
Best ResponseYou've already chosen the best response.0oh, whoops. i didn't see that before. i'll go there next time.

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1mean is 0.2 ? which formula did u use ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0total is 1, divided by 5, .2? did i do that wrong?

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1yes... Mean = \(\sum xP(x)\) so, it will be mean = 0.2*4 + 0.25*3 + ......

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0oooh. okay. one sec. let me calculate that. :P

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1don't u have answers to verify ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0nope. answers are given upon completion. :P

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0but thanks, I think I got it now. Wrong formula. :P

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1and u know formula for sd ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0yeah, got that. i compared that with a friend, and she got the same answer. it was just the mean.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0hartnn, 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.
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