Mathematics, 14.02.2020 05:09 carolinagarciap8kgmi
An absent-minded professor has n keys in his pocket of which only one (he does not remember which one) fits his office door. He picks a key at random and tries it on his door. If that does not work, he picks a key again to try, and so on until the door unlocks. Let X denote the number of keys that he tries. Find the pmf of X in the following two cases: (a) A key that does not work is put back in his pocket so that when he picks another key, all n keys are equally likely to be picked (sampling with replacement). (b) A key that does not work is put in his briefcase so that when he picks another key, he picks at random from those remaining in his pocket (sampling without replacement).
Answers: 3
Mathematics, 21.06.2019 21:00, kharmaculpepper
Joanie watched 1 out of three of a movie in the morning
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Mathematics, 22.06.2019 00:30, tremainecrump1466
Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)
Answers: 2
Mathematics, 22.06.2019 02:00, ashiteru123
The function h (t) = -16t squared + 28t + 500 represents the height of a rock t seconds after it's propelled by a slingshot what does h (3.2) represent?
Answers: 1
An absent-minded professor has n keys in his pocket of which only one (he does not remember which on...
English, 02.09.2019 16:20