# Recent content by noreturn2

1. ### Boolean Matrix

Well if you have 1*1 on any column that value is autoamtically 1. So if you like at row 1 column one on each that is why I get a 1 in the corner
2. ### Boolean Matrix

Boolean values can only be 1 or 0. I think you are right that it is still wrong. I re did it and I got: [ 1 1 1 0 1 0 1 1 1]
3. ### Boolean Matrix

Homework Statement Homework Equations The Attempt at a Solution Does my logic seem right, I'm doubtin my anwsers.
4. ### Continuous Probability

Homework Statement f(x) = (3/4)(-x^2 + 6x - 8) for 2 < x < 4 (0 elsewhere) A) Find F(x) integral 2 to 4 ((3/4)(-x^2 + 6x - 8))dx B) Use F(x) to find P(3 < X < 3.5) integral 3 to 3.5 ((3/4)(-x^2 + 6x - 8))dx 11/32 C) Use F(x) to find P(X > 3.5) 1-( P(3 < X < 3.5)) = 21/31 D) Find E(X)...
5. ### Mean and STDev

Ok so here is what I have let me know if this looks better Mean: .21 87(0)+8(1)+3(2)+1(4)+1(3)=21/100 STDev: E[x^2]-[E[x]]^2 .45-(.21)^2=.4059 sqrt(.4059) STDEVA: .637
6. ### Mean and STDev

So would it be .45/100%= .0045, which seems also wrong but makes sense. Since the .45 is the number of quarters in the "system" sorta say, and then we accounted for 100% of the population.
7. ### Mean and STDev

So what is throwing me off is I think my calculation of the mean is incorrect. Because more people has 0 quarters then say 2 quarters, the the mean should theoretically be less then 2 correct?
8. ### Mean and STDev

So my answer of .64043 was correct?
9. ### Mean and STDev

I forgot to add in part of the problem statement. I've added that. x^2f(x)
10. ### Mean and STDev

Homework Statement Mind mean and STDev of number of quarters someone has on them at one time 0 - 87% 1 - 8% 2 - 3% 3- 1% 4 - 1% The first time I did this I assumed a population but she said that was wrong and not what she was looking for. Here was my new attempt: x^2f(x)= 0(.87) 1(.08) 4(.03)...
11. ### Probability of Opening a Pushbutton Lock

Alright I remember this! So : 1: 1/252 2: 1/252 * 251/252 3: 1/252 * 251/252 * 250/251 4: 1/252 * 251/252 * 250/251 * 249/250... Geometric: (1/252)/(1-(1/252)) = still get .003 tho :(
12. ### Probability of Opening a Pushbutton Lock

In your case you would be subtracting them, which would be arthemtic.
13. ### Probability of Opening a Pushbutton Lock

How can I set this up with the formula?
14. ### Probability of Opening a Pushbutton Lock

251/252 is not guessing the right number 250/251 would be not guessing the 2nd time (since we have one less guess made)
15. ### Probability of Opening a Pushbutton Lock

Could do a geometric series right. So: 1/252+1/251+1/250 +1/249.... 1/242 Just dont know hwo to set it up using that formula a(a-r^n)/1-r n=10 r=?