Recent content by zhfs

thanks for your help!

Homework Statement This question relates to a famous court case in the USA where for the first time results of statistical analysis were presented as evidence of discrimination. In 1972 Mr Partida, a Mexican-American, was convicted of burglary by a jury in a particular county in Texas. Mr...

i don't know what's wrong with my typing i tis not showing right but B is standard basis for R3 100,010,001 and B' is [1 -1; 1 1]

Homework Statement let T : R3 --> R2 be the transformation defined by T([x]) = [y+z] y x+z...

Homework Statement Trials of a biology experiment are performed, and each trial is independent of the other trials. Each experiment trial has a 0.13 probability of a success, and 0.87 probability of failure. (c) Let Y denote the random variable representing the number of trials up to and...

thank you guys!

[solved]probability question Homework Statement Three machines A, B, and C produce 50%, 30% and 20% respectively of the total number of items at a factory. Each produces a number of defective: 3%, 4% and 5% respectively. (a) If an item produced by one of these machines is selected, find...

Homework Statement use the subspace theorem to decide if the sets is a real vector space with respect to the usual operation the set of all solutions of the homogenous differential equation 7f''(x) +4f'(x) -6f(x) = 0 Homework Equations none The Attempt at a Solution try to...

james, first of all thank you very much for your explaining, that helps me a lot. but still i have some question to ask you, can you please help me out as well? i just got no idea what is the set of the soluiton of those d.e. do i need to use y=a^ex to solve them or i need to reduce them into...

how to proof if the solution set of a second order diffential equation af''+bf'+cf=0 is a real vector space w.r.t. the usual opeations?