Recent content by Economics2012

Thank you so much :) Can I ask why you use 120 here?

I knew it had to do with sampling, so I just took 4 from 5.5 and got 1.5 on the http://www.cs.washington.edu/homes/jrl/normal_cdf.pdf here and that's how I got it, I think that's more than likely completely incorrect. P(M>4), that's what I thought you did. Am i way off?

Thank you very much, your too good. Sorry about the question marks. Can I ask you one more thing What would be the probability of drawing 30 tiles and obtaining a meal tile number of less than 4? I keep getting .9332 by using the tables of the normal distribution, I know that's probably...

Sorry, I don't understand what you mean?

Homework Statement If you have a box of 1,000 items, with numbers 1-10 on them, 100 for each! And this proves the discrete uniform probability distribution. 1/10 for each.Homework Equations Mean = u = Exp(x) = e(x) St dev worked out by the variation. St Dev = square root of the variation...

Adding the x's across and then you get the y's by adding down.

I found the x and y mean... u=Ep(x)x ux=(10)(0.1)+(14)(0.5)+)(16)(0.4) = 14.4 -> mean for X by using the marginals uy= same procedure I got 21.61. Do you know how you get the median for this, if you understand what I mean?

Well see the table looks a bit odd there Y is along the top and X is along the left hand side. 9,15 and 30 are belong to Y and 10,14 and 16 are belong to X. then the numbers are in the table. It says find the means, medians and st devs of X and Y. I did what you said before I posted here, but...

Joint Distribution (Means,Medians...) PLEASE HELP! Hi, I'm wondering if somebody could help me understand this... If you have a joint distribution with Hourly Wage (Y) Years of Education (X) 9 15 30 10 0.07 0.02 0.01 14...