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radh
 2 years ago
Best ResponseYou've already chosen the best response.1Grades 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

radh
 2 years ago
Best ResponseYou've already chosen the best response.1openstudy has a stats section?

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

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

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

lilfayfay
 2 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 :))

radh
 2 years ago
Best ResponseYou've already chosen the best response.1finding 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?

radh
 2 years ago
Best ResponseYou've already chosen the best response.1oh, whoops. i didn't see that before. i'll go there next time.

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

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

hartnn
 2 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 + ......

radh
 2 years ago
Best ResponseYou've already chosen the best response.1oooh. okay. one sec. let me calculate that. :P

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

radh
 2 years ago
Best ResponseYou've already chosen the best response.1nope. answers are given upon completion. :P

radh
 2 years ago
Best ResponseYou've already chosen the best response.1but thanks, I think I got it now. Wrong formula. :P

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

radh
 2 years ago
Best ResponseYou've already chosen the best response.1yeah, got that. i compared that with a friend, and she got the same answer. it was just the mean.

hanban1
 one year 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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