ap statistics question?

Question

"A random variable Y has the following distribution:

Y-------> ( -1) ( 0) (1) ( 2)
p(Y) -----> (3c) ( 2c) ( 0.4 ) (0.1)

the value of the constant C is:

a.) 0.10
b.) 0.15
c.) 0.20
d.) 0.25
e.) 0.75



what is the answer and why?!?!?!

Answer 1

You need to find the value of c such that you have a probability mass function. for any discrete random variable, if you sum over all possible values of X then the sum will equal 1.

P(Y = -1) + P(Y = 0) + P(Y = 1) + P(Y = 2) = 1
3c + 2c + 0.4 + 0.1 = 1
5c = 0.5
c = 0.1

if c = 0.1 then you have a probability mass function.

Answer 2

AP stat is greater troublesome to appreciate however the calculations are uncomplicated and person-friendly AP Calc is uncomplicated to appreciate yet calculations are plenty tougher and lots greater tedious...and you each so often won't be able to even get stunning solutions which includes integrating e^(-(x^2))...you finally end up employing estimations (i've got self assurance it quite is one million/ sqrt(pi) for the ex I mentioned...possibly thoroughly incorrect on the estimation tho

Answer 3

This question is totally irrelevant for this section of the yahoo answers world.

Please, unless you are contemplating whether you should run around your neighborhood wearing nothing but a purple cape or sit home and shave your cat, you should not be here.

Answer 4

The answer my friend is blowing in the wind.

Answer 5

C. Because it's the middle answer.

Answer 6

STOP IT! You're hurting my brain!

Answer 7

Please, sir, heed my warning:
Everyone here is too stupid, drunk or don't care about your question.
Go ask in a different category