# Search results

1. ### Boolean Matrix

Homework Statement Homework Equations The Attempt at a Solution Does my logic seem right, I'm doubtin my anwsers.
2. ### 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)...
3. ### 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)...
4. ### Probability of Opening a Pushbutton Lock

Homework Statement A password has numbers 0-9 in it. The password is 5 digits, repeats are not allowed, and order doesn't matter (I just have to have the correct 5 digit buttons depressed). A. If I guess at the password, what is the probability that the box will open? B. If I have completely...
5. ### Axioms of Probablity

Homework Statement Give an factory of cell phones there is a .5 rejections, .2 repaired, and .2 acceptable. Does this follow the axioms of probability. Homework Equations Sample space = 1; Probaby: 0 -1 P(AnB)=P(A)+P(B) The Attempt at a Solution Technically this does follow the axioms, there...
6. ### Probability of Situations

Homework Statement Assume a job has 12 applicants, and 4 job openings. I want me and my 3 friends to all get the job. What is this probability. Homework Equations ! Factorial and Permuation & combinatoins The Attempt at a Solution Number of possible solutions: 12C4 = 495 Possible ways Number...
7. ### Laplace Transform

Homework Statement Homework Equations The Attempt at a Solution 1. I got Y(s) = (15s +18)/(5s^2+s-2) 2. I got Y(s) = (7s - 7iw + 1)/((s+4)(5 - iw)) Was just wanting to make sure I solved these right. I would type it out but without formating, it will look messy.