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radhBest ResponseYou've already chosen the best response.1
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
 one year ago

radhBest ResponseYou've already chosen the best response.1
openstudy has a stats section?
 one year ago

lilfayfayBest ResponseYou've already chosen the best response.0
at the top it will say "Find More Subjects"
 one year ago

radhBest ResponseYou've already chosen the best response.1
yeah, I know part a. It's legitimate because the total probability is equal to 1.
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
good, thats correct. where r u stuck ?
 one year ago

lilfayfayBest ResponseYou've already chosen the best response.0
Yeah its at the very bottom if you click on "Find More Subjects" at the top :))
 one year ago

radhBest ResponseYou've already chosen the best response.1
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?
 one year ago

radhBest ResponseYou've already chosen the best response.1
oh, whoops. i didn't see that before. i'll go there next time.
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
mean is 0.2 ? which formula did u use ?
 one year ago

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

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

radhBest ResponseYou've already chosen the best response.1
oooh. okay. one sec. let me calculate that. :P
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
don't u have answers to verify ?
 one year ago

radhBest ResponseYou've already chosen the best response.1
nope. answers are given upon completion. :P
 one year ago

radhBest ResponseYou've already chosen the best response.1
but thanks, I think I got it now. Wrong formula. :P
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
and u know formula for sd ?
 one year ago

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

hanban1Best ResponseYou've already chosen the best response.0
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.
 one year ago
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