Question

Statistics? ;P How do I find the variance of the probability distribution? I feel like i'm getting it wrong.

Answer 1

http://puu.sh/6Voat.png

Answer 2

@wio

Answer 3

@jim_thompson5910

Answer 4

I got 3.4 for mean
2.2 for variance
and 1.5 for prob distribution

Answer 5

variance = sum squared deviations/ n-1

Answer 6

you mean 1.5 for standard deviation?

Answer 7

Oh yeah the book calls it "Standard deviation of the probability distribution" sorry haha

Answer 8

your answers look about right

Answer 9

http://puu.sh/6Vp2J.png

Answer 10

And that is yes but for what reason?

Answer 11

or is it B because of the negative 0.10?

Answer 12

http://en.wikipedia.org/wiki/Discrete_probability_distribution#Discrete_probability_distribution

you are right, the distribution cant have neg probabilities

Answer 13

Thank you!